feat(templates): make second click as confirmation on templates picker

[luka-nextcloud]

• Resolves: Template picker UX improvements #49109

Summary

Accept the second click as create confirmation.

Video

demo.webm

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[elzody]

Works for me, and the code changes are pretty straightforward. Most of the tests for the template picker are actually in the richdocuments repository, but maybe it would also be beneficial to have a small test in there for this?