ROX-29116: Use ARM GH action workflow runners for ARM builds

[robbycochran]

Description

Utilize newly added arm64 runners for github actions.

• Build arm64 images natively instead of using QEMU in all workflows
• Make arm64 builds, unit-tests, and integration tests run alongside x86_64 by default on PR workflows. Build time performance is slightly faster on ARM so it shouldn't increase total time to finish PR steps.
• Split and refactored the builder image job into a local and remote version

Checklist

• Investigated and inspected CI test results
• Updated documentation accordingly

Automated testing

• Added integration tests

If any of these don't apply, please comment below.

Testing Performed

• test run with run-multiarch-builds label -> [testing] branch rc-gh-action-arm on multiarch label #2094
• CI passes on PR with arm64 builds and tests
• testing on master commits, schedule runs, or release branches 🤷

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.40%. Comparing base (3106b4b) to head (216401d).
Report is 3 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2084      +/-   ##
==========================================
+ Coverage   27.53%   28.40%   +0.87%     
==========================================
  Files          93       94       +1     
  Lines        5724     5717       -7     
  Branches     2532     2531       -1     
==========================================
+ Hits         1576     1624      +48     
+ Misses       3481     3383      -98     
- Partials      667      710      +43     

Flag	Coverage Δ
collector-unit-tests	28.40% <ø> (+0.87%)	⬆️

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[Molter73]

The arm image builds in 6 minutes 😻

[sourcery-ai]

Hey @robbycochran - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider using matrix.set instead of environment variables and github-script to pass the list of architectures to the manifest creation steps.
• The conditional logic for s390x in the builder image job seems overly complex and could be simplified.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

---

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[Molter73]

Just a couple comments on the runner version, but other than that LGTM!

Thanks for putting the effort into this, it simplifies a lot of code in our CI and it'll be great to have arm built and tested on all PRs!