chore: introduce script to help create release

[thisislawatts]

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What does this PR do?

Introduces a script that can be used to create a short lived branch to update the release-candidate branch ahead of a release process.

How should this be manually tested?

Run the script to verify that a new tmp/* branch is created and pushed to remote
./release-scripts/prepare-release.sh

✨ For folks with the gh CLI tool installed it will even create the PR for you.

[thisislawatts]

I am open to ideas for what to include on the --body

[j-luong]

question: is the PR created here exempt from the PR template?

[thisislawatts]

@j-luong it will be yes if we supply a --body value.

[j-luong]

question: would it be worth following the template and using --body-file to reference the file? Although we'd have to automate filling it in.

I've no strong opinion either way, but if we wanted to include stuff in the body, that's what I'd suggest.

[cmars]

I don't see the value of making an automated process follow the template.