Add test script for capped collection behavior

[b1ron]

Description

Closes #4023.

Closes FerretDB/dance/issues/753.

The behavior for capped collections is not consistent with MongoDB. Documents should be removed in a FIFO manner.

Readiness checklist

• I added/updated unit tests (and they pass).
• I added/updated integration/compatibility tests (and they pass).
• I added/updated comments and checked rendering.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I ensured that PR title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Milestone (Next), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.96%. Comparing base (c299c53) to head (8080370).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4022      +/-   ##
==========================================
- Coverage   74.70%   73.96%   -0.74%     
==========================================
  Files         339      339              
  Lines       22910    22910              
==========================================
- Hits        17114    16946     -168     
- Misses       4477     4665     +188     
+ Partials     1319     1299      -20     

see 18 files with indirect coverage changes

Flag	Coverage Δ
filter-true	67.36% <ø> (-0.84%)	⬇️
hana-1	?
integration	67.36% <ø> (-0.84%)	⬇️
mongodb-1	5.13% <ø> (ø)
postgresql-1	46.43% <ø> (-0.10%)	⬇️
postgresql-2	49.55% <ø> (-0.11%)	⬇️
postgresql-3	49.82% <ø> (-0.02%)	⬇️
sqlite-1	45.69% <ø> (-0.06%)	⬇️
sqlite-2	48.78% <ø> (-0.01%)	⬇️
sqlite-3	49.00% <ø> (ø)
unit	32.69% <ø> (ø)

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