ci: centralize ci-package-manager

[lumirlumir]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

In this PR, I've centralized the ci-package-manager workflow as part of the effort to centralize workflows (ref: eslint/workflows#4).

I renamed the workflow file from ci-build-all-pm to ci-package-manager to make its purpose clearer.

For detailed context, please refer to eslint/workflows#25.

What changes did you make? (Give an overview)

In this PR, I centralized the ci-package-manager workflow.

Related Issues

Refs: eslint/workflows#25, eslint/workflows#4

Is there anything you'd like reviewers to focus on?

N/A

[Copilot]

Pull request overview

This PR centralizes the package manager CI workflow as part of the broader ESLint organization effort to consolidate reusable workflows into the eslint/workflows repository. The previous local implementation (ci-build-all-pm.yml) contained 131 lines of workflow definition that tested package installation across npm, Yarn v1, Yarn Modern, pnpm, and bun. This has been replaced with a 14-line wrapper that references the centralized workflow.

Key Changes:

• Replaced local ci-build-all-pm.yml workflow (131 lines) with centralized reference in ci-package-manager.yml (14 lines)
• Added *.tgz to .gitignore to exclude npm pack outputs from version control

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
.gitignore	Added *.tgz pattern to ignore tarball files generated by npm pack during workflow execution
.github/workflows/ci-package-manager.yml	New workflow file that references the centralized ci-package-manager workflow from eslint/workflows repository
.github/workflows/ci-build-all-pm.yml	Removed local workflow implementation (now centralized)

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