ci: Refactor changelog workflow to use reusable workflow

[juanjjaramillo]

Which problem is this PR solving?

In order to simplify maintenance and avoid duplication, changelog workflow is now using a reusable workflow

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Security fix
• New feature / enhancement (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

New Tests?

Please describe the new tests that were added (if applicable).

• This change requires changes in testing:
  • unit tests
  • e2e tests

Checklist:

• Add changelog entry following the contributing guide
• Tests have been added
• Documentation has been updated