[chore] ci: fail a PR that changes the package without a changeset

[arpit-bruno]

BRU-4716

A PR that changes packages/bruno-api-docs now fails the changeset check unless it adds a new .changeset/*.md. Markdown-only, integrations-only and CI-only PRs pass on their own.
Tests-only or chore PRs can add the skip-changeset label.

Also: a PR that only changes changeset.yml or integrations-matrix.yml no longer runs lint, unit, build and e2e for the renderer. ci.yml changes still run everything.

[changeset-bot]

⚠️ No Changeset found

Latest commit: cac3845

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR