initial commit of new reusable gha stub

[sarasvoss]

PR Summary

Jira: https://opensesame.atlassian.net/browse/CORE-XXXX

Description of Changes

Adding reusable GHA for running npm scripts for CI

Versioning

⚠️ Components in this repo are used by multiple repos and teams. Breaking changes to non-versioned components are high-risk. Always apply correct versioning to versioned components to ensure safe, controlled updates.

Versioned components live under ./github/actions

Does this PR modify a versioned component?

• No — label this PR with version:untracked
• Yes
  • Add a version label: version:<component-name>/X.Y.Z
  • Ensure the component’s CHANGELOG.md includes a ## X.Y.Z entry
  • Use version:untracked only if changes do not alter behavior, inputs, or outputs

If version labels are incorrect or missing, automated version validation will fail and block merge.

Dependencies of PR

N/A

Testing

tested in internal_ GHA runs for this repo's CI

[github-actions]

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