Update breakage: use organization-wide workflow

[MaxenceGollier]

Following JuliaSmoothOptimizers/.github#18.

[Copilot]

Pull request overview

This PR updates the repository’s “Breakage” CI to delegate implementation to the JuliaSmoothOptimizers organization-wide reusable workflows (per JuliaSmoothOptimizers/.github#18), removing the previously in-repo breakage implementation.

Changes:

• Replace the local Breakage.yml implementation with a call to JuliaSmoothOptimizers/.github/.github/workflows/Breakage.yml.
• Add a CommentBreakage.yml workflow to post results via an org-wide reusable workflow triggered by workflow_run.
• Remove the local .breakage Julia helper script and its dedicated project file.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
.github/workflows/CommentBreakage.yml	Adds a workflow_run-triggered job that calls the org-wide PR-commenting reusable workflow.
.github/workflows/Breakage.yml	Replaces the large in-repo workflow with a call to the org-wide reusable Breakage workflow.
.breakage/get_jso_users.jl	Removes the local dependency-discovery helper script.
.breakage/Project.toml	Removes the local project file used by the deleted helper script.

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[tmigot]

Thanks @MaxenceGollier ! This one needs the formatting we mentioned before.