[PR] Fix HTTP 500 Internal Server Error if DAG is triggered with bad params [airflow]

[via GitHub]

jscheffl opened a new pull request, #39409:
URL: https://github.com/apache/airflow/pull/39409

   We have noticed that if you attempt to trigger a DAG via stable API with 
invalid parameters (e.g. bad values not mathcing to model/schema, missing 
required fields) that a HTTP 500 with "Uuups" text is returned.
   
   The API endpoint did not check for ParamValidationError - which is fixed 
with this PR. Now with this PR applied a correct HTTP 400 with details is 
returned.
   
   Swagger test looks like this - but added a test on API as well:
   
![image](https://github.com/apache/airflow/assets/95105677/134a4fd2-65a1-4d89-b275-3e4e112e03bd)
   


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