Paginate GitHub events query for PR reminders

[AetherUnbound]

Fixes

This fixes an issue we found after merging #2027 - an undrafted PR was pinged for review only a day after being ready for review, but the PR message said it was 12 days since the PR was ready (see #1891). After some investigation, we found that this is because the GitHub API defaults to 30 events per page in the events endpoint: https://docs.github.com/en/rest/issues/events?apiVersion=2022-11-28#list-issue-events

Description

This PR adds some very simple pagination to the get_issue_events function to enable querying all of the events for a PR prior to determining whether it should be pinged.

Testing Instructions

Follow the testing instructions outlined in #2027, but note that #1891 should not be included in the list of PRs to ping.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

Developer Certificate of Origin

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[stacimc]

Good catch!

[zackkrida]

The pagination logic looks good. LGTM!