FIX: Optimizing test run time without impacting coverage (#380)

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[AB#41135](https://sqlclientdrivers.visualstudio.com/c6d89619-62de-46a0-8b46-70b92a84d85e/_workitems/edit/41135)

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### Summary   
This pull request refactors and optimizes the
`tests/test_013_SqlHandle_free_shutdown.py` test suite to improve test
execution speed and maintainability. The main changes include reducing
iteration counts and timeouts for faster test runs, and consolidating
several similar tests into a single parameterized test using
`pytest.mark.parametrize`. This makes the tests more efficient and
easier to manage.

Test performance improvements:
* Reduced the number of iterations in connection churn and GC cycles,
and lowered subprocess timeouts from 30 seconds to 5 seconds across
multiple tests for much faster execution.
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Test suite maintainability:
* Combined multiple similar tests for `_cleanup_connections()` into a
single parameterized test using `pytest.mark.parametrize`, reducing code
duplication and improving readability. The scenarios now covered are:
normal flow, already closed connections, missing `_closed` attribute,
exception handling, multiple connections, and WeakSet behavior.
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Test framework modernization:
* Added `pytest` import and usage to support parameterized testing.

Test output and assertion updates:
* Updated test assertions and output strings to match the new, reduced
iteration counts and to ensure test correctness after refactoring.
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These changes make the test suite faster, more robust, and easier to
extend in the future.

Author: subrata-ms

tests/test_004_cursor.py

@@ -10370,7 +10370,7 @@ def test_procedures_result_set_info(cursor, db_connection):
         cursor.execute("EXEC pytest_proc_schema.test_no_results")
         # Procedures with no results should have no description and calling fetchall() should raise an error
         assert (
-            cursor.description is None,
+            cursor.description is None
         ), "test_no_results should have no description (no result set)"
         # Don't call fetchall() on procedures with no results - this is invalid in ODBC