Modify CODEOWNERS to change file ownership

[Borda]

What does this PR do?

Updated code owners for various files and directories.

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
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• Did you make sure to update the docs?
• Did you write any new necessary tests?

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[Copilot]

Pull Request Overview

This PR updates the CODEOWNERS file to redistribute ownership responsibilities across various files and directories in the repository. The changes involve removing @Borda from most ownership assignments while adding @lantiga to global ownership and adjusting specific file ownerships.

Key Changes:

• Updated global owners to replace @Borda with @lantiga
• Redistributed ownership for core files like README.md and setup.py
• Removed documentation-related ownership entries entirely

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37%. Comparing base (fd967c0) to head (e261ecd).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #3297    +/-   ##
=======================================
- Coverage      37%     37%    -1%     
=======================================
  Files         364     349    -15     
  Lines       20096   19901   -195     
=======================================
- Hits         7520    7326   -194     
+ Misses      12576   12575     -1     

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