[SE-4232] Add latest OSPR, Core Committer and OEP changes

This PR extends our existing Pull Request related processes, to ensure OSPRs are accepted by upstream and we meet their requirements.

JIRA tickets: SE-4232

Discussions:

• https://forum.opencraft.com/t/core-committer-workflow-in-jira/804
• https://forum.opencraft.com/t/edx-to-adopt-conventional-commits/870

Dependencies: None

Screenshots:

Sandbox URL: N/A

Merge deadline: None

Testing instructions:

1. Run make install_prereqs
2. Run make compile
3. Run make run
4. Navigate to http://127.0.0.1:8000/pull_request_process/
5. Proofread and check the changes

Author notes and concerns:

N/A

Reviewers

• @giovannicimolin