[8] Move the DB group over to the tox gen script

[sentrivana]

• remove hardcoded entries for sqlalchemy, pymongo, redis_py_cluster_legacy, clickhouse_driver from the tox template
• remove them from the ignore list in populate_tox.py
• run populate_tox.py to fill in entries for them
• run split_gh_tox_actions.py to generate the CI yaml files so that they correspond to the new tox.ini

The remaining integrations in this group are not trivial to port to the script, I'll do this step by step in follow-up PRs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.35%. Comparing base (c6b5994) to head (6560a44).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3978      +/-   ##
==========================================
+ Coverage   80.32%   80.35%   +0.02%     
==========================================
  Files         140      140              
  Lines       15510    15510              
  Branches     2628     2628              
==========================================
+ Hits        12459    12463       +4     
+ Misses       2209     2207       -2     
+ Partials      842      840       -2     

see 3 files with indirect coverage changes