chore(ci): migrate to reusable workflows

[sofiasimdianova]

What changed

Why

Risk

LOW | MEDIUM | HIGH

Validation

• Baseline validation: N/A
• Targeted tests: N/A
• Full suite / broader validation: N/A

Architecture / behavior impact

N/A

Review focus

Known concerns

None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.37%. Comparing base (e56b43c) to head (f55f49e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1861      +/-   ##
==========================================
- Coverage   81.39%   81.37%   -0.02%     
==========================================
  Files         206      206              
  Lines       11356    11356              
==========================================
- Hits         9243     9241       -2     
- Misses       1557     1558       +1     
- Partials      556      557       +1     

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[NumaryBot]

✅ Approve — automated review

No actionable defects were identified in the workflow migration or Earthfile removal.

No findings.