Add group/project selector to fine-grained PAT create page

Daniel Tianrequested to merge
570708-add-group-project-selector-to-pat-form into 579765-add-scope-radio-buttons-to-create-pat-form

What does this MR do and why?

Adds the project/group selector and shows a list of the ones added:
ksnip_20251117-153239

References

Screenshots or screen recordings

Before After

How to set up and validate locally

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Related to #570708

Edited by Daniel Tian

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