Add Retry option to Add-to-project action

[zwick]

• Closes Add retry possibility #505

Context

Users of this action have reported failing tasks due to a race condition with this action. The above linked PR suggested adding a retry capability to the Octokit call. A plugin exists for Octokit to retry failed requests utilizing a standard Backoff and was leveraged for this functionality.

Changes

• Installed and imported octokit-retry package to action
• Automatically retry failed requests in the Add-to-project action

[skw]

@zwick Were you planning to get this PR ready for review? I think you may need to update the package.json and lock file.

[zwick]

@skw My efforts are a bit stuck at the moment. The failures in these tests are accurate, we are having some Typescript compatibilities between the Retry plugin and the version of Octokit Core bundled with @actions/github.

I'm currently down a bit of a rabbit hole while attempting to leverage @octokit/core instead. Importing this requires rewriting the action to an ES Module instead of targeting commonjs. However I am having issues with successfully importing Octokit Core after the change to a module.

This won't be ready until this can be solved, but I'm trying to not spend an exceeding amount of time on it.