[MAINTENANCE] Add functional tests for `FormatRepository`#1940

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beatrycze-volk wants to merge 3 commits intokitodo:mainfrom

beatrycze-volk:format-repository-test

Commits on Apr 27, 2026

[MAINTENANCE] Use FormatRepository for loading formats in AbstractDocument
beatrycze-volk
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Commits on Apr 28, 2026

[MAINTENANCE] Add functional tests for `FormatRepository`
beatrycze-volk
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[MAINTENANCE] Refine TODO about `FormatRepository` empty results
beatrycze-volk
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