SQL Server - multiple autogenerate failures, tests aren't running

[zzzeek]

the identity feature seems to have widespread failures with SQL server, tests have not been running. need to enable testing with pyodbc, add to CI, repair identity feature

FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_cant_change_computed_warning[<lambda>0] - AssertionError: 1 != 0
FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_cant_change_computed_warning[<lambda>1] - AssertionError: 1 != 0
FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_cant_change_computed_warning[<lambda>2] - AssertionError: 1 != 0
FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_cant_change_computed_warning[<lambda>3] - AssertionError: 1 != 0
FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_computed_unchanged[<lambda>-_exclusions0] - AssertionError: 1 != 0
FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_computed_unchanged[<lambda>-_exclusions1] - AssertionError: 2 != 0
FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_computed_unchanged[<lambda>-_exclusions2] - AssertionError: 1 != 0
FAILED tests/test_autogen_computed.py::AutogenerateComputedTest_mssql+pyodbc_14_0_3356_20::test_remove_computed_column - AssertionError: ('modify_default', None,...
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[sqla-tester]

Mike Bayer has proposed a fix for this issue in the master branch:

Enable SQL Server testing and fix autogen issues https://gerrit.sqlalchemy.org/c/sqlalchemy/alembic/+/2514