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Backport #28140 by @earl-warren - Make use of the `form-fetch-action` for the merge button, which will automatically prevent the action from happening multiple times and show a nice loading indicator as user feedback while the merge request is being processed by the server. - Adjust the merge PR code to JSON response as this is required for the `form-fetch-action` functionality. - Resolves https://codeberg.org/forgejo/forgejo/issues/774 - Likely resolves the cause of https://codeberg.org/forgejo/forgejo/issues/1688#issuecomment-1313044 (cherry picked from commit 4ec64c19507caefff7ddaad722b1b5792b97cc5a) Co-authored-by: Earl Warren <109468362+earl-warren@users.noreply.github.com> Co-authored-by: Gusted <postmaster@gusted.xyz>