test: test multiple versions of pg and pg-pool

[rauno56]

Which problem is this PR solving?

We claim support for 7.x and 8.x, but don't test to ensure that. Adding tests.

Short description of the changes

I'm adding TAV(test-all-versions package) setup for pg in this PR to test the most popular versions across the supported range:

• 7.3.0 - errors on connecting to postgres v14, narrowing down the test-utils version to avoid contributors running into the same issue.
• 7.12.1
• 7.18.2
• 8.5.1
• 8.6.0
• 8.7.1

7.x branch does not work with node 14+. I'm disabling TAV runs on those versions. npm run test still runs whatever the node version is.

[codecov]

Codecov Report

Merging #751 (0c8522d) into main (bdfbcd4) will decrease coverage by 1.65%.
The diff coverage is 81.81%.

❗ Current head 0c8522d differs from pull request most recent head 24ba89e. Consider uploading reports for the commit 24ba89e to get more accurate results

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
- Coverage   96.87%   95.22%   -1.66%     
==========================================
  Files          11       73      +62     
  Lines         640     6239    +5599     
  Branches      126      615     +489     
==========================================
+ Hits          620     5941    +5321     
- Misses         20      298     +278     

Impacted Files	Coverage Δ
...e/opentelemetry-instrumentation-pg/test/pg.test.ts	94.13% <72.72%> (ø)
...ntelemetry-instrumentation-pg/test/pg-pool.test.ts	90.21% <75.00%> (ø)
...ode/opentelemetry-instrumentation-pg/test/utils.ts	90.47% <90.47%> (ø)
...y-instrumentation-cassandra/src/instrumentation.ts	80.37% <0.00%> (ø)
...entelemetry-instrumentation-aws-sdk/src/aws-sdk.ts	96.91% <0.00%> (ø)
...urce-detector-alibaba-cloud/src/detectors/index.ts	100.00% <0.00%> (ø)
...detector-aws/src/detectors/AwsBeanstalkDetector.ts	95.65% <0.00%> (ø)
...emetry-instrumentation-aws-sdk/src/services/sqs.ts	89.65% <0.00%> (ø)
...pentelemetry-instrumentation-pg/test/utils.test.ts	98.36% <0.00%> (ø)
...etry-instrumentation-aws-sdk/test/dynamodb.test.ts	100.00% <0.00%> (ø)
... and 54 more