chore(CODEOWNERS): Remove unused teams

Description

Removes teams that are no long in active use. Any rows that would then be limited to inherited rules were removed.

Fixes b/364335594 for nodejs-docs-samples.

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

[ ] I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
[ ] Tests pass: npm test (see Testing)
[ ] Lint pass: npm run lint (see Style)
[ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
[ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
[ ] This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
[ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
[ ] This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
[ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
[ ] Please merge this PR for me once it is approved