Improve beta release workflow

[Jakeii]

What does this change?

Auto remove the label similar to how run_chromatic works in DCR

Add install commands to the PR comment

Don't run anything unless label is the correct one (this leads to action failures for PRs from non-admins)

Add a more helpful error message if you forget to add a changeset

[changeset-bot]

🦋 Changeset detected

Latest commit: 323a8e3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@guardian/commercial	Patch

Not sure what this means? Click here to learn what changesets are.

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

[github-actions]

🚀 0.0.0-beta-20240508152902 published to npm as a beta release

To install the beta version, run one of the following commands in your project directory:

  npm install @guardian/commercial@0.0.0-beta-20240508152902
  pnpm add @guardian/commercial@0.0.0-beta-20240508152902
  yarn add @guardian/commercial@0.0.0-beta-20240508152902