Fix CODEOWNERS

[Alirexaa]

Code owners' roles end with an underscore. Only the directory and files that start with an underscore are assigned to the given person or team, not all files and subdirectories.

After this PR is merged the following code owner icon should appear on each owned file.

File in the main branch:

File in the PR branch:

PR Checklist

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• PR doesn't include merge commits (always rebase on top of our main, if needed)
• New integration
  • Docs are written
  • Added description of major feature to project description for NuGet package (4000 total character limit, so don't push entire description over that)
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Contains NO breaking changes
• Every new API (including internal ones) has full XML docs
• Code follows all style conventions

Other information

[aaronpowell]

Thanks, I think the mistake has come from linting tools