chore(CODEOWNERS): expand @argoproj/argocd-approvers-ci role ownership

[dudinea]

Implements expansion of @argoproj/argocd-approvers-ci ownership
to the files/directories related to CI, build and code scanning configurations.

The hack/ directory is somewhat messy, the most compact way
seems to be use exclusions for unrelated stuff.

Some of this stuff is related to documentation generation,
like "/hack/gen-docs/" and some other scripts.
should be given to the @argoproj/argocd-approvers-docs?

Closes: #27697

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Title of the PR
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.88%. Comparing base (14b9d68) to head (727c6b0).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #27721      +/-   ##
==========================================
+ Coverage   63.84%   63.88%   +0.03%     
==========================================
  Files         418      417       -1     
  Lines       57269    57211      -58     
==========================================
- Hits        36566    36547      -19     
+ Misses      17290    17256      -34     
+ Partials     3413     3408       -5     

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[ppapapetrou76]

LGTM - great addition