Various enhancements to the GitHub Library to support our Temporal platform

[doggydogworld]

This introduces four enhancements to the GitHub library that will be useful for our Temporal work.

• Returning the HTML URL is useless for other libraries to rely on which is why it wasn't originally included. However it is good for enhancing user experience and for debugging when trying to track down a failed job.
• Rerunning failed workflows has been added to allow for recovery of transient failures. Temporal can orchestrate this to recover from transient failures in workflows.
• The GitHub App client now has a helper method to obtain the currently active OAuth token. This will be useful when our Temporal work needs to interact with Git directly (cloning teleport.e) which needs a valid token to authenticate with.
• Duration is returned in WorkflowInfo. This will be used in our Temporal workflow to bubble up metrics related to GitHub Actions performance.

[aadc-dev]

for posterity, the use of the clientID is recommended now: https://docs.github.com/en/apps/creating-github-apps/authenticating-with-a-github-app/generating-a-json-web-token-jwt-for-a-github-app

Currently the appID is used.