chore: add test for search result and user pagination

[AkesiSeli]

Technical details

This PR adds the tests for DefaultSearchPaginationManager and DefaultUserPaginagionManager.

Additional notes

There was a bug in the offset parameters passed to the v1/accounts/:id/statuses endpoint discovered in this test.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
unittests	56.71% <100.00%> (+6.66%)	⬆️

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Files with missing lines	Coverage Δ
...content/pagination/DefaultUserPaginationManager.kt	63.12% <100.00%> (+63.12%)	⬆️

... and 3 files with indirect coverage changes

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