chore(gha): check changelog changes on pull request

[cesararroba]

Context

We want to check if changes are written on their respective CHANGELOG.md. This workflow checks if there are changes on api, prowler and ui folders and if their changelog file has been modified. A comment will be shown on the PR if there are missed changes.

https://prowlerpro.atlassian.net/browse/PRWLR-7403

Description

• Add check-changelog workflow

Checklist

• Are there new checks included in this PR? Yes / No
  • If so, do we need to update permissions for the provider? Please review this carefully.
• [ ] Review if the code is being covered by tests.
• [ ] Review if code is being documented following this specification https://github.com/google/styleguide/blob/gh-pages/pyguide.md#38-comments-and-docstrings
• [ ] Review if backport is needed.
• [ ] Review if is needed to change the Readme.md
• [ ] Ensure new entries are added to CHANGELOG.md, if applicable.

API

• [ ] Verify if API specs need to be regenerated.
• [ ] Check if version updates are required (e.g., specs, Poetry, etc.).
• [ ] Ensure new entries are added to CHANGELOG.md, if applicable.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.