Split Resyntax integration into two workflows

[jackfirth]

See the comment in resyntax-analyze.yml for why.

[samth]

Don't you need to use pull_request_target somewhere?

[jackfirth]

...oops. Yes I do. Will fix that in a sec.

[jackfirth]

@samth wait no, actually I don't need to use pull_request_target anymore. Instead, I use workflow_run. The second workflow runs when the first one finishes, and the first one doesn't need pull_request_target because it no longer needs write access to the repository.