feat: Improve pull request discovery

[sasjo]

Pull Request Details

Improve pull request discovery to support push workflows.

Description

PR mode and PR comments requires a pull request or issue number to be included with the event that triggers the workflow. This only applies to pull_request workflows and not the push workflow.

This change uses Octokit to find pull requests from the branch reference when no pull_request event is available. The PR resolution means we can support pr-mode and post-pr-comment from push workflows if a pull request exists for the branch.

Related Issue

Motivation and Context

Our organization is transitioning from SonarCloud to Qodana. Our workflows are running on push events and we're accustomed to pull requests being found and commented on automatically.

How Has This Been Tested

Types of changes

• Docs change / refactoring / dependency upgrade
• 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)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My commit messages are styled with gitmoji
• My change requires a change to the documentation.
  • Qodana for GitHub
  • Qodana for Azure Pipelines
  • Qodana for CircleCI
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.