[receiver/oracledb] return -1 if max tablespace size is not set

[atoulme]

Description:
Rather than reporting an error, return -1 if the metric representing the tablespace max size is not set.

Link to tracking Issue:
Fixes #18670

Testing:
Unit test.

Documentation:
N/A

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test duration(55 minutes 7 seconds) has decreased 11 minutes 36 seconds compared to main branch avg(1 hour 6 minutes 43 seconds).

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✅  check-links workflow has finished in 47 seconds (1 minute 48 seconds less than main branch avg.) and finished at 16th Feb, 2023.

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Job	Failed Steps	Tests
changed files	-     🔗	N/A	See Details
check-links	-     🔗	N/A	See Details

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✅  telemetrygen workflow has finished in 1 minute 12 seconds (1 minute 54 seconds less than main branch avg.) and finished at 16th Feb, 2023.

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Job	Failed Steps	Tests
build-dev	-     🔗	N/A	See Details
publish-latest	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

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✅  prometheus-compliance-tests workflow has finished in 3 minutes 49 seconds (4 minutes 56 seconds less than main branch avg.) and finished at 16th Feb, 2023.

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Job	Failed Steps	Tests
prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  build-and-test workflow has finished in 55 minutes 7 seconds (10 minutes 42 seconds less than main branch avg.) and finished at 16th Feb, 2023.

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Job	Failed Steps	Tests
unittest-matrix (1.19, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, internal)	-     🔗	✅ 561  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	-     🔗	✅ 1529  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, extension)	-     🔗	✅ 537  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, processor)	-     🔗	✅ 1529  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	-     🔗	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2574  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-0)	-     🔗	✅ 2574  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	-     🔗	✅ 2455  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1931  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, exporter)	-     🔗	✅ 2455  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, other)	-     🔗	✅ 4687  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, other)	-     🔗	✅ 4687  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-1)	-     🔗	✅ 1931  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	-     🔗	✅ 55  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details
check-collector-module-version	-     🔗	N/A	See Details
check-codeowners	-     🔗	N/A	See Details
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lint-matrix (receiver-0)	-     🔗	N/A	See Details
lint-matrix (receiver-1)	-     🔗	N/A	See Details
lint-matrix (processor)	-     🔗	N/A	See Details
lint-matrix (exporter)	-     🔗	N/A	See Details
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lint-matrix (internal)	-     🔗	N/A	See Details
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build-examples	-     🔗	N/A	See Details
lint	-     🔗	N/A	See Details
unittest (1.20)	-     🔗	N/A	See Details
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cross-compile (darwin, amd64)	-     🔗	N/A	See Details
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cross-compile (linux, ppc64le)	-     🔗	N/A	See Details
cross-compile (windows, 386)	-     🔗	N/A	See Details
cross-compile (windows, amd64)	-     🔗	N/A	See Details
build-package (deb)	-     🔗	N/A	See Details
build-package (rpm)	-     🔗	N/A	See Details
windows-msi	-     🔗	N/A	See Details
publish-check	-     🔗	N/A	See Details
publish-dev	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

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✅  load-tests workflow has finished in 11 minutes 1 second (5 minutes 41 seconds less than main branch avg.) and finished at 16th Feb, 2023.

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Job	Failed Steps	Tests
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 18  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details

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✅  e2e-tests workflow has finished in 11 minutes 25 seconds (4 minutes 39 seconds less than main branch avg.) and finished at 16th Feb, 2023.

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Job	Failed Steps	Tests
kubernetes-test	-     🔗	N/A	See Details

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⭕  build-and-test-windows workflow has finished in 3 seconds (41 minutes 38 seconds less than main branch avg.) and finished at 18th Feb, 2023.

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Job	Failed Steps	Tests
windows-unittest-matrix	-     🔗	N/A	See Details
windows-unittest	-     🔗	N/A	See Details

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✅  changelog workflow has finished in 3 minutes 23 seconds (⚠️ 48 seconds more than main branch avg.) and finished at 18th Feb, 2023.

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changelog	-     🔗	N/A	See Details

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[evan-bradley]

Looks good to me, just some minor suggestions.