[chore] fix the metadata of extension/xextension/storage

[atoulme]

Description

• add new metadata.yaml file to extension/xextension/storage and add @swiatekm as codeowner there
• remove @swiatekm from metadata.yaml file at extension/xextension
• regenerate codeowners

Link to tracking issue

Fixes #12382

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.54%. Comparing base (f9562a0) to head (8d15f76).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12398   +/-   ##
=======================================
  Coverage   91.54%   91.54%           
=======================================
  Files         467      467           
  Lines       25618    25618           
=======================================
  Hits        23451    23451           
  Misses       1768     1768           
  Partials      399      399           

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