out_azure_kusto: avoid logging workload identity token

[admhn]

Summary

• Prevent the federated workload identity token from being included in an INFO log.

Fixes #12145

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Testing

• [N/A] Example configuration file for the change
• [N/A] Debug log output from testing
• [N/A] Attached Valgrind output that shows no leaks or memory corruption was found
• ctest --test-dir build -R flb-rt-out_azure_kusto --output-on-failure (1/1 passed)
• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• [N/A] Documentation required for this feature

Backporting

• [N/A] Backport to latest stable release.

Summary by CodeRabbit

• Bug Fixes
  • Removed an unnecessary informational log message during Azure workload identity authentication.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a10f3a4b-d14c-4e34-92c1-52273fe94b35

📥 Commits

Reviewing files that changed from the base of the PR and between 0cee842 and 257e2bd.

📒 Files selected for processing (1)

• plugins/out_azure_kusto/azure_msiauth.c

💤 Files with no reviewable changes (1)

• plugins/out_azure_kusto/azure_msiauth.c

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📝 Walkthrough

Walkthrough

Azure workload identity token acquisition no longer logs the federated token after reading it. Request construction continues unchanged.

Changes

Azure workload identity logging

Layer / File(s)	Summary
Redact sensitive authentication logs plugins/out_azure_kusto/azure_msiauth.c	The informational log containing the federated token was removed, and execution proceeds to request-body construction.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: cosmo0920

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: removing workload identity token logging from out_azure_kusto.
Linked Issues check	✅ Passed	The change removes the INFO log that exposed the federated token, matching #12145's requirement.
Out of Scope Changes check	✅ Passed	The PR only touches the token logging path in azure_msiauth.c and stays within the issue scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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