Small addition to YAML formatter usage

[rumyantseva]

Description

Closes #1301.

In this PR:

• Change permissions only for linux.
• Run yaml formatter as part of fmt task.
• In this PR, I also run yaml formatter to format our current yaml files.

Readiness checklist

• I added/updated unit tests.
• I added/updated integration/compatibility tests.
• 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), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[codecov]

Codecov Report

Merging #2524 (341d93f) into main (eaaa9b5) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2524   +/-   ##
=======================================
  Coverage   64.34%   64.34%           
=======================================
  Files         403      403           
  Lines       19954    19954           
=======================================
  Hits        12840    12840           
  Misses       6185     6185           
  Partials      929      929           

see 1 file with indirect coverage changes

Flag	Coverage Δ
integration	57.29% <ø> (ø)
mongodb	5.07% <ø> (ø)
pg	57.22% <ø> (ø)
unit	25.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[w84thesun]