Propagate annotations of the OTelCol and TA custom resources to the TA deployment resource

[mikel-jason]

Description:

• Propagate annotations of the OTelCol and TA custom resources to the TA deployment resource. Note: This is not about pod annotations.
• Refactor: Rename the annotation function so it's similar to the ones for the OTelCol. To me it was quite confusing to see that the TA func is called Annotations but means PodAnnotations. I just renamed it without any further change for backwards compatibility. Yet it would be debatable if it's the pod annotation which should be put on the pdb and netpol. That's a different topic though.

Resolves: #4393

Testing:

• I didn't manage to get the tests running on my machine (envsetup failed). go test ./internal/manifests/... succeeds. As the changes are limited to that package, I guessed it's enough to raise the PR and see the checks in the CI pipelines.
• Tested the functionality manually in a kind cluster

Documentation: None

[pavolloffay]

Do you mind changing an existing e2e test and add an annotation?

[github-actions]

E2E Test Results

 34 files  ±0  221 suites  ±0   1h 59m 46s ⏱️ - 17m 34s
 88 tests ±0   88 ✅ ±0  0 💤 ±0  0 ❌ ±0 
225 runs  ±0  225 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 1bb74b0. ± Comparison against base commit b9dcedc.

♻️ This comment has been updated with latest results.

[mikel-jason]

Sure, I'll take a look next week once I'm back in the office

[mikel-jason]

Added to E2E tests (both OTelCol and TA CR). The E2E test failed in the run before (targetallocator-metrics) was a time-out, succeeds when running locally (same k8s version)

E2E test report files from running locally

e2e-targetallocator.xml

<testsuites name="chainsaw-report" time="122.310130" tests="5">
  <testsuite name="tests/e2e-targetallocator/targetallocator-metrics" tests="1" failures="0" errors="0" id="0" time="">
    <testcase name="targetallocator-metrics" classname="" time="19.465504"></testcase>
  </testsuite>
  <testsuite name="tests/e2e-targetallocator/targetallocator-features" tests="1" failures="0" errors="0" id="0" time="">
    <testcase name="targetallocator-features" classname="" time="58.856568"></testcase>
  </testsuite>
  <testsuite name="tests/e2e-targetallocator/targetallocator-namespace" tests="1" failures="0" errors="0" id="0" time="">
    <testcase name="targetallocator-namespace" classname="" time="62.172559"></testcase>
  </testsuite>
  <testsuite name="tests/e2e-targetallocator/targetallocator-prometheuscr" tests="1" failures="0" errors="0" id="0" time="">
    <testcase name="targetallocator-prometheuscr" classname="" time="84.477224"></testcase>
  </testsuite>
  <testsuite name="tests/e2e-targetallocator/targetallocator-kubernetessd" tests="1" failures="0" errors="0" id="0" time="">
    <testcase name="targetallocator-kubernetessd" classname="" time="90.068652"></testcase>
  </testsuite>
</testsuites>

e2e-targetallocator-cr.xml

<testsuites name="chainsaw-report" time="9.713641" tests="2">
  <testsuite name="tests/e2e-targetallocator-cr/targetallocator-label" tests="1" failures="0" errors="0" id="0" time="">
    <testcase name="targetallocator-label" classname="" time="1.035330"></testcase>
  </testsuite>
  <testsuite name="./tests/e2e-targetallocator-cr" tests="1" failures="0" errors="0" id="0" time="">
    <testcase name="targetallocator-cr" classname="" time="4.327177"></testcase>
  </testsuite>
</testsuites>

https://github.com/open-telemetry/opentelemetry-operator/actions/runs/18187651149/job/52051597858#step:8:213

I kindly request you to review again. Thanks in advance!

[pavolloffay]

@swiatekm could you please review as well?

[swiatekm]

Looks like you have some test failures @mikel-jason, can you have a look?

[mikel-jason]

Solved and rebased.

DONE 1849 tests, 3 skipped in 116.096s

FYI I found out I can run the tests with make test while go test as explained in the contrib guide gives me some /tmp/.../tls.crt no such file or directory error

opentelemetry-operator/CONTRIBUTING.md

Lines 110 to 119 in 4cbac0f

	### Unit tests
	Some unit tests use [envtest](https://book.kubebuilder.io/reference/envtest.html) which requires Kubernetes binaries (e.g. `api-server`, `etcd` and `kubectl`) to be present on the host filesystem. Makefile takes care of installing all dependent binaries, however running the tests from IDE or via `go test` might not work out-of-the-box. The `envtest` uses env variable `KUBEBUILDER_ASSETS` that points to a directory with these binaries. To make the test work in IDE or `go test` the environment variable has to be correctly set.
	Example how to run test that use `envtest`:
	```bash
	make envtest
	KUBEBUILDER_ASSETS=$(./bin/setup-envtest use -p path 1.23) go test ./pkg...
	```