[CI] Add skip_tests input to test-all workflow for faster marketplace builds

[Eyal-Danieli]

Summary

• Adds a skip_tests boolean input to the workflow_dispatch trigger in .github/workflows/test-all.yaml, letting maintainers manually run the workflow and bypass run_monorepo_tests.
• Gates run_monorepo_tests on the new input so push events on development/master still execute the full test suite - only manual dispatches with the box checked skip it.
• Updates the build-marketplace job condition to always() plus needs.run_monorepo_tests.result == 'success' || 'skipped', so the marketplace build runs even when tests are skipped.

Motivation

When iterating on marketplace generation we often need to rebuild the marketplace quickly without waiting on the per-package test matrix. This adds an opt-in escape hatch without changing default CI behavior on push.

How to use

Actions → Test all assets, build marketplace → Run workflow → check Skip run_monorepo_tests and go straight to build-marketplace → Run.