Allow overriding checks for integration version bump PRs
Reason for change
We have a lot of PRs these days
Fixes a minor annoyance that the test package version bump PRs can't be merged unless you rebase/force-merge, because the checks don't automatically run
Summary of changes
Reason for change
Implementation details
Mostly copy-paste
Test coverage
Meh
Other details
Moved these from https://github.com/DataDog/dd-trace-dotnet/pull/5728 so we can merge this one sooner