chore: Update CODEOWNERS and remove un-used OWNERS file

[bryantbiggs]

What does this PR do?

• Update CODEOWNERS and remove un-used OWNERS file
  • OWNERS is not used and is a convention used with prow which we do not use here

Motivation

• Team is growing 🎉

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs require a new example and/or doc page. In general:

• Use an existing example when possible to demonstrate a new addons usage
• A new docs page under docs/add-ons/* is required for new a new addon

For Moderators

• E2E Test successfully complete before merge?

Additional Notes