CI: Move cockpit tests to GCP from RHOS (HMS-10341)

[tkoscieln]

Migrate RHOS runners to GCP for cockpit gitlab tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.83%. Comparing base (999d20e) to head (120f09c).

@@            Coverage Diff             @@
##             main    #4720      +/-   ##
==========================================
- Coverage   77.93%   77.83%   -0.10%     
==========================================
  Files         264      264              
  Lines        7066     7066              
  Branches     2603     2603              
==========================================
- Hits         5507     5500       -7     
- Misses       1460     1472      +12     
+ Partials       99       94       -5     

Flag	Coverage Δ
playwright	59.91% <ø> (-0.10%)	⬇️
vitest	72.91% <ø> (ø)

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see 3 files with indirect coverage changes

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[sourcery-ai]

Hey - I've left some high level feedback:

• Confirm that any job scripts or environment variables that were specific to the RHOS/OpenStack runners (e.g., network config or cloud metadata usage) are still valid or have been updated for the GCP runner environment.
• Consider whether the expanded matrix (additional Fedora and RHEL versions) should be split into separate jobs or stages if runtime or resource usage becomes an issue on GCP runners.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Confirm that any job scripts or environment variables that were specific to the RHOS/OpenStack runners (e.g., network config or cloud metadata usage) are still valid or have been updated for the GCP runner environment.
- Consider whether the expanded matrix (additional Fedora and RHEL versions) should be split into separate jobs or stages if runtime or resource usage becomes an issue on GCP runners.

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[regexowl]

Changes look great, let's see what the tests think 🤞

[tkoscieln]

The tests agree 🚀