This just provides some sane reminders and ticks a box on the GitHub UI. This
change also cleans up the issue template, as there is already an automatic
link to the repository's security disclosure policy.
PiperOrigin-RevId: 307868833
This allows us to specify a richer configuration for the issue template, that
effectively moves a lot of the "metadata" from the template itself to the main
issue page.
PiperOrigin-RevId: 307666509