Added custom implementation of GH Action

[BabyElias]

Description

• Added custom implementation of Github Action to check whether CHANGELOG.md has been updated in the created Pull request or not
• Removed Github 3rd party application, used official Github REST APIs for the implementation

Issue addressed

#481

Before/after screenshots

Changelog

• #505
  • Description: Added custom implementation of GH action that checks that changelog is updated in each pull request
  • Products impact:
  • Addresses: -
  • Components: -
  • Breaking:
  • Impacts a11y:
  • Guidance: -

[MisRob]

Hi @BabyElias, thank you! I asked @rtibbles to review in more detail. Also I'd like to ask if you had a chance to verify that the check still fails when the changelog file is not present in a pull request?

[BabyElias]

@MisRob , Yes I did.
Attaching a screenshot of the same

[MisRob]

@BabyElias Great, thanks! If the code looks good to Richard, I think we can merge then.