feat(target allocator): add OTLP self-telemetry API to CRDs

[odubajDT]

CRD + operator wiring for the TargetAllocator OTLP self-telemetry feature:

• spec.targetAllocator.telemetry.metrics.otlp (OpenTelemetryCollector CR) and spec.telemetry.metrics.otlp (TargetAllocator CR), typed fields for endpoint, protocol (grpc/http), temporality, headers, TLS/insecure, export interval/timeout
• operator renders the telemetry block into the TargetAllocator ConfigMap
• generated CRDs, bundles, API docs, deepcopy

Refs #5047

Based on #5068

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.46%. Comparing base (adc7406) to head (c4cffde).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5293      +/-   ##
==========================================
+ Coverage   63.39%   63.46%   +0.07%     
==========================================
  Files         217      217              
  Lines       15505    15541      +36     
==========================================
+ Hits         9829     9863      +34     
- Misses       4986     4987       +1     
- Partials      690      691       +1     

Flag	Coverage Δ
integration	69.73% <ø> (ø)
unittests	63.46% <100.00%> (+0.07%)	⬆️

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[swiatekm]

I think this configuration should at the very least be a subset of the declarative config, same as what we implemented for the target allocator itself. @pavolloffay as the person who investigated generating CRDs based on the declarative config spec, what do you think the easiest way to accomplish this is?

[odubajDT]

I think this configuration should at the very least be a subset of the declarative config, same as what we implemented for the target allocator itself. @pavolloffay as the person who investigated generating CRDs based on the declarative config spec, what do you think the easiest way to accomplish this is?

Hi, totally agree and already working on it. Honestly, I forgot to change the PR to draft, as I didn't manage to finish and push the changes yesterday. Sorry for that, will try to put it together today.

The version here still contained the old state of CRDs (before the TA binary OTLP selfmon changes were merged).

[odubajDT]

@swiatekm should be ready :)