[AGENTONB-2672] Refresh credentials for every sendMetadata

[Eokye]

What does this PR do?

A brief description of the change being made with this pull request.

Currently, with the way metadata forwarder is written, secret refreshes will not work. Creds are gotten only once, instead of on every send of data like in metric forwarders. A small refactor is needed.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

1. Set log level to debug inmanager.yaml
2. See that metadata forwarder is succesfully started and successfully sending metadata in logs
   example:
   {"level":"DEBUG","ts":"2025-11-10T18:36:37.933Z","logger":"metadata","msg":"Read operator metadata response","status code":202,"body":"Accepted"}

By virtue of getting creds before every send, MetadataForwarders will use updated creds to send metadata to datadog. Creds are only updated in case of a secret change (the secret used in the datadog-agent manifest) or a refresh from a secret refresh for operator creds.

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.68%. Comparing base (ba27d3f) to head (c3a5c9a).

Files with missing lines	Patch %	Lines
pkg/controller/utils/metadata/operator_metadata.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2295   +/-   ##
=======================================
  Coverage   37.68%   37.68%           
=======================================
  Files         258      258           
  Lines       21690    21690           
=======================================
  Hits         8174     8174           
  Misses      12883    12883           
  Partials      633      633           

Flag	Coverage Δ
unittests	37.68% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/controller/utils/metadata/operator_metadata.go	12.17% <0.00%> (ø)

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