We decided to change the automatic assignment of issues and PRs to follow the oncall rotation.

Description

Removes the old workflows that did auto assignment and added new manual workflows that call the pagerduty and github APIs to get and add assignees from oncall rotation.

How Has This Been Tested?

Tested on private repo.

Screenshots (if appropriate):

N/A

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (add or update README or docs)
• Others

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.