[AIRFLOW-XXX] Update Alembic autogenerator to pass pylint

[ashb]

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Jira

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Description

• Update the template alembic uses for creating migrations to pass (or at least be closer to passing) pylint checks

[codecov-io]

Codecov Report

Merging #6216 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #6216 +/- ##
==========================================
- Coverage 80.02% 80.01% -0.02% 
==========================================
Files 610 610 Lines 35176 35176 ==========================================
- Hits 28151 28147 -4 - Misses 7025 7029 +4

Impacted Files	Coverage Δ
airflow/contrib/operators/ssh_operator.py	82.5% <0%> (-1.25%)	⬇️
airflow/utils/dag_processing.py	56.37% <0%> (-0.52%)	⬇️

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[potiuk]

Nit: Should we split it to two separate commits? Filtering out of Flask Appbuilder tables should be separate commit I think.

[ashb]

Nit: Should we split it to two separate commits? Filtering out of Flask Appbuilder tables should be separate commit I think.

Good call, will do as two separate PRs. Done, other PR #6221