🚀 Feature: Deduplicate posted comments

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

Right now, each contribution per user generates a single comment via the GitHub API:

all-contributors-auto-action/src/postContributionComment.ts

Lines 44 to 47 in 7ef9782

	// TODO: It'd be nice to deduplicate these comments.
	// PRs that include multiple types will cause multiple comments...
	// https://github.com/JoshuaKGoldberg/all-contributors-auto-action/issues/180
	const newComment = await octokit.request(...commentRequestArgs);

I haven't investigated this deeply but think it should be able to ask for multiple contributions in a single comment. If a user has multiple contributions out of a single issue or PR, it'd be nice to mention multiple in a comment:

@allcontributors please add <person> for bug, maintenance

Additional Info

Within this repo, I'm guessing the postContributionComment function will need to be changed up a bit.

all-contributors/app#127 is a good starting reference to see things on the allcontributors side. Though that PR is for multiple contributors per comment. I'd really like to see multiple contribution types per comment.