fix: Fix PR template

[georgegillams]

PLT-3430

The PR template was accidentally applied to all repos in Typeform that don't have a PR template.

This introduces:

• An alternative PR template that's appropriate for the whole org
• A PR template just for PRs to main in this repo, which includes specifics about this repo

Note: Please do not use this repository for new internal shared workflows and actions. Use https://github.com/Typeform/.github-private instead!

Please check that your contribution applies to one of these cases below. If this is not the case, please contribute to https://github.com/Typeform/.github-private instead.

• This PR only changes an existing workflow.
• This PR adds a new workflow that is needed in a public Typeform repository.

[gitstream-cm]

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.github/PULL_REQUEST_TEMPLATE.md

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[gitstream-cm]

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