Update breakage: use organization-wide workflow

[MaxenceGollier]

Following JuliaSmoothOptimizers/.github#18.

[Copilot]

Pull request overview

This PR migrates the repository’s “Breakage” CI and PR-commenting logic to organization-wide reusable GitHub Actions workflows (per JuliaSmoothOptimizers/.github#18), removing the repo-local breakage implementation.

Changes:

• Replace the repo’s custom Breakage workflow with a reusable workflow call.
• Add a separate CommentBreakage workflow that runs on completion of the Breakage workflow and delegates to the org reusable workflow.
• Remove the now-unused .breakage Julia helper script and its Project.toml.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/Breakage.yml	Replaced the previous multi-job implementation with a call to the org-wide reusable Breakage workflow.
.github/workflows/CommentBreakage.yml	New workflow to delegate PR commenting to the org-wide reusable CommentBreakage workflow after Breakage completes.
.breakage/get_jso_users.jl	Removed unused helper script (logic moved to org workflow).
.breakage/Project.toml	Removed unused breakage workflow dependencies (logic moved to org workflow).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.32%. Comparing base (fc3ab2f) to head (22b05a0).
⚠️ Report is 41 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #380       +/-   ##
===========================================
- Coverage   92.23%   78.32%   -13.92%     
===========================================
  Files          13       13               
  Lines        1597     1836      +239     
===========================================
- Hits         1473     1438       -35     
- Misses        124      398      +274     

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