[ci skip] Don't run GitHub actions on forks

Closes GH-8111
Closes GH-8119

[ci skip] [Close stale PRs] Enable GitHub action

[Close stale PRs] Skip RFCs and "Waiting on Review"

Pull requests with the "Waiting on Author" label should still not be
closed if they have the RFC label as closing them requires manual

[Close stale PRs] Skip RFCs and "Waiting on Review"

Pull requests with the "Waiting on Author" label should still not be
closed if they have the RFC label as closing them requires manual
action. Also avoid closing "Waiting on Review".

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[ci skip] Close stale PRs with GitHub actions

Closes GH-7999