fix: GHA frontend builds fail when frontends hasn't changed

[mistercrunch]

I just merged #31490 and realized it fails when no frontend changes are found. It will run the first workflow and fail on subsequent.

This PR makes it such that the first workflow emits an output to tell the other workflows to skip if needed.

To test it, I had to remove the regex in scripts/change_detector.py that looks whether the specific GHA I'm altering here has been changed and it skipped as expected:

... and reenabled the rule after testing

[korbit-ai]

I've completed my review and didn't find any issues... but I did find this frog.

           .--._.--.
          ( O     O )
          /   . .   \
         .`._______.'.
        /(           )\
      _/  \  \   /  /  \_
   .~   `  \  \ /  /  '   ~.
  {    -.   \  V  /   .-    }
_ _`.    \  |  |  |  /    .'_ _
>_       _} |  |  | {_       _<
 /. - ~ ,_-'  .^.  `-_, ~ - .\
         '-'|/   \|`-`

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