sdks/python/scripts: capture (...) pytest marker group (#35740)

* scripts: capture `(...)` pytest marker group

* workflows: trigger postcommit python

* workflows: trigger postcommit python

Author: moawnallah

.github/trigger_files/beam_PostCommit_Python.json

@@ -1,5 +1,5 @@
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run.",
-  "modification": 29
+  "modification": 101
 }
 

sdks/python/scripts/run_pytest.sh

@@ -43,7 +43,7 @@ echo "pytest_args: $pytest_args"
 echo "posargs: $posargs"
 
 # Define the regex for extracting the -m argument value
-marker_regex="-m\s+('[^']+'|\"[^\"]+\"|[^ ]+)"
+marker_regex="-m\s+('[^']+'|\"[^\"]+\"|\([^)]+\)|[^ ]+)"
 
 # Initialize the user_marker variable.
 user_marker=""