Migrate deprecated runner tags

[tbavelier]

Summary

Migrates deprecated GitLab runner tags to new architecture-specific tags.

Changes

• runner:main → arch:amd64
• runner:docker → docker-in-docker:amd64

Background

The runner:main and runner:docker tags are deprecated. See announcement.

Validation

• Verified YAML syntax remains valid
• No other changes made

Replaces #2782 and #2783

[chatgpt-codex-connector]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.78%. Comparing base (d134930) to head (b51466e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2784   +/-   ##
=======================================
  Coverage   38.78%   38.78%           
=======================================
  Files         309      309           
  Lines       26852    26852           
=======================================
  Hits        10414    10414           
  Misses      15658    15658           
  Partials      780      780           

Flag	Coverage Δ
unittests	38.78% <ø> (ø)

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