Add django.db.backends.postgresql to postgresql ENGINE matching

[fopina]

I was unable to list tables in my app and once I started looking into this, there were 3 different things:

• NoTable was not supported in django-admin - an exception was thrown due to non-existing field (size)
• After adding size, it still wasn't working (maybe it never did?) because it actually tried to query a non-existing table - now added a custom manager to always return none queryset
• There's a different ENGINE also supported for psycopg2 and those using it would end up with NoTable - added it to the list

Also updated the workflows

[codecov-commenter]

Codecov Report

Base: 85.11% // Head: 85.35% // Increases project coverage by +0.23% 🎉

Coverage data is based on head (c14649c) compared to base (f35239a).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   85.11%   85.35%   +0.23%     
==========================================
  Files           6        6              
  Lines         309      314       +5     
==========================================
+ Hits          263      268       +5     
  Misses         46       46              

Impacted Files	Coverage Δ
dbcleanup/models.py	95.23% <100.00%> (+0.41%)	⬆️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication