Speedup test check by splitting long specs into smaller one

[ShockwaveNN]

For code like

TestingApiOnlyfficeCom::CommunityServerAPI.parsed_document_entries.each_pair

and

TestingApiOnlyfficeCom::BuilderPage.parsed_document_entries.each_pair do |editor, class_hash|

we can split those on several same-looking specs, but instead of running all the specs in same file - we could run for example only 1/5 in one file and 2/5 in other file, and 3/5 in other file

So there will be 5 files with something like:

TestingApiOnlyfficeCom::CommunityServerAPI.parsed_document_entries.split(2, 5).each_pair

Similar thing already done in testing-documentserver for long specs for the formulas:
https://github.com/ONLYOFFICE-QA/testing-documentserver/blob/fd44559d5b5148926511170be58765ad8728e040/spec/modules/spreadsheets/spreadsheet_editor/formula/check_formula_counting/check_formula_counting_2_spec.rb#L16