CP-30918: feat: Removing devexreviewers

[flatherskevin]

Description of the change

Removing devexreviewers

Type of change

• Bug fix
• New feature

Checklists

Development

• All changed code has 80% unit test coverage
• All changed code has been automatically (smoke test or otherwise) or manually verified in alfa (or with a cross namespace setup, e.g. developer namespace for this feature, pointing at shared alfa resources)

[greptile-apps]

Greptile Summary

This PR implements an organizational change by updating code ownership and documentation to reflect a team restructuring. Specifically:

1. In .github/CODEOWNERS, the @cloudzero/devexreviewers team is replaced with @cloudzero/nimbus while maintaining @cloudzero/octo as co-owners
2. The RELEASE_PROCESS.md documentation is updated to replace all references to 'DevEx Team' with 'Nimbus Team' as key stakeholders in the release process

This change maintains the existing dual-team review structure while updating the responsible parties to reflect the new organizational structure.

Confidence score: 5/5

1. This PR is very safe to merge as it only updates team names in documentation and code ownership
2. The changes are straightforward, consistent across files, and don't affect any functional code
3. Key files to review:
   • .github/CODEOWNERS
   • docs/RELEASE_PROCESS.md

_{2 files reviewed, 1 comment}

_{Edit Code Review Bot Settings | Greptile}

[greptile-apps]

style: Extra whitespace at the end of line should be removed

Suggested change

	* @cloudzero/nimbus @cloudzero/octo
	* @cloudzero/nimbus @cloudzero/octo