Update CODEOWNERS (#5817)
Update CODEOWNERS (#5817)

* add `yoshi-approver` to just about everything.
* add `j-s-r` to .github/auto-approve.yml
GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples