feat(ci): add tests for MongoDB

[RobertCraigie]

Change Summary

Please summarise the changes this pull request is making here.

Checklist

• Unit tests for the changes exist
• Tests pass without significant drop in coverage
• Documentation reflects changes where applicable
• Test snapshots have been updated if applicable

Agreement

By submitting this pull request, I confirm that you can use, modify, copy and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Patch coverage: 93.78% and project coverage change: +2.62 🎉

Comparison is base (edc9b66) 86.52% compared to head (82e72b5) 89.14%.

❗ Current head 82e72b5 differs from pull request most recent head 35df155. Consider uploading reports for the commit 35df155 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #566      +/-   ##
==========================================
+ Coverage   86.52%   89.14%   +2.62%     
==========================================
  Files         128      137       +9     
  Lines        6240     6229      -11     
  Branches     1027     1101      +74     
==========================================
+ Hits         5399     5553     +154     
+ Misses        796      632     -164     
+ Partials       45       44       -1     

Impacted Files	Coverage Δ
databases/_types.py	0.00% <0.00%> (ø)
databases/constants.py	0.00% <0.00%> (ø)
databases/main.py	0.00% <0.00%> (ø)
databases/tests/arrays/test_bigint.py	100.00% <ø> (ø)
databases/tests/arrays/test_bool.py	100.00% <ø> (ø)
databases/tests/arrays/test_bytes.py	100.00% <ø> (ø)
databases/tests/arrays/test_datetime.py	100.00% <ø> (ø)
databases/tests/arrays/test_decimal.py	100.00% <ø> (ø)
databases/tests/arrays/test_enum.py	100.00% <ø> (ø)
databases/tests/arrays/test_float.py	100.00% <ø> (ø)
... and 23 more

... and 14 files with indirect coverage changes

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