Add service-account type authentication to GitHub Actions and system tests

[scholzj]

Type of Change

• Task

Description

This PR adds the new service-account option to the system test executions in GitHub Action and adapts the system tests to pass with it.

Checklist

• Update documentation
• Make sure all tests pass
• AI assistance was used to create this PR (see the Strimzi AI policy)

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.86%. Comparing base (f6776c2) to head (04ba0c6).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #13137      +/-   ##
============================================
- Coverage     80.93%   80.86%   -0.07%     
+ Complexity     6741     6737       -4     
============================================
  Files           355      355              
  Lines         23072    23072              
  Branches       3148     3148              
============================================
- Hits          18673    18658      -15     
- Misses         3175     3187      +12     
- Partials       1224     1227       +3     

see 4 files with indirect coverage changes

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[scholzj]

/gha run pipeline=regression,upgrade

[github-actions]

⏳ System test verification started: link
Internal cluster security: encryption tls, authentication mtls

The following 10 job(s) will be executed:

• regression-brokers-and-security-amd64 (cncf-ubuntu-8-32-x86)
• regression-operators-amd64 (cncf-ubuntu-8-32-x86)
• regression-operands-amd64 (cncf-ubuntu-8-32-x86)
• regression-brokers-and-security-arm64 (cncf-ubuntu-8-32-arm)
• regression-operators-arm64 (cncf-ubuntu-8-32-arm)
• regression-operands-arm64 (cncf-ubuntu-8-32-arm)
• upgrade-azp_kraft_upgrade-amd64 (cncf-ubuntu-4-16-x86)
• upgrade-azp_kafka_upgrade-amd64 (cncf-ubuntu-4-16-x86)
• upgrade-azp_kraft_upgrade-arm64 (cncf-ubuntu-4-16-arm)
• upgrade-azp_kafka_upgrade-arm64 (cncf-ubuntu-4-16-arm)

Tests will start after successful build completion.

[github-actions]

❌ System test verification failed: link

[github-actions]

🎉 System test verification passed: link