chore: Add natemort and c-warren to CODEOWNERS

[c-warren]

What changed?

Adds some new (and old) cadence team members and removes some cadence team members who no longer work on the product.

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Reviewer Validation

PR Description Quality (check these before reviewing code):

• "What changed" provides a clear 1-2 line summary
  • Project Issue is linked
• "Why" explains the full motivation with sufficient context
• Testing is documented:
  • Unit test commands are included (with exact go test invocation)
  • Integration test setup/commands included (if integration tests were run)
  • Canary testing details included (if canary was mentioned)
• Potential risks section is thoughtfully filled out (or legitimately N/A)
• Release notes included if this completes a user-facing feature
• Documentation needs are addressed (or noted if uncertain)

[neil-xie]

we can remove @sankari165

[c-warren]

I didn't remove them because they're still at Uber but it's a fair point.

[gitar-bot]

Code Review Update - Latest Changes ✅

Reviewed the latest commit (c8d5838 "MORE") which added 4 additional team members.

Complete PR Changes:

• Added 12 new team members: @adhityamamallan @macrotim @Assem-Uber @abhishekj720 @fimanishi @bowenxia @timl3136 @eleonoradgr @gazi-yestemirova @arzonus @c-warren @natemort
• Removed 3 former team members: @agautam478 @3vilhamster @taylanisikdemir
• File syntax is valid and follows CODEOWNERS format

Assessment:
Clean administrative change with no risks. All changes are metadata-only updates to automatic reviewer assignments. Ready for merge once CI completes.

[gitar-bot]

Code Review ✅ Approved

Clean administrative change updating CODEOWNERS with team membership changes. No code logic changes, just metadata updates to reviewer assignments.

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