[PR] Fix --from-pr feature for image load and stabilize help [airflow]

["potiuk (via GitHub)" <gi...@apache.org>]

potiuk opened a new pull request, #45575:
URL: https://github.com/apache/airflow/pull/45575

   This is a follow-up after #45564 - it fixes the `--from-pr` and `--from-run` to work (it was failing with file does not exist).
   
   Also found out that gettempdir might return different directory depending on which is your designated tmp directory (for example in MacOS this is is a longer path in /var/.....) - so we have to force the default during help generation to always return "/tmp" so that the --help images do not change depending on which system you are and what your tmp directory is.
   
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Re: [PR] Fix --from-pr feature for image load and stabilize help [airflow]

["potiuk (via GitHub)" <gi...@apache.org>]

potiuk merged PR #45575:
URL: https://github.com/apache/airflow/pull/45575


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