fix: Return after create quota to avoid duplicate set-quota request

[fregataa]

In all inherited QuotaModel, both create_quota_scope() and update_quota_scope() methods create quota scope.
PATCH /quota-scope API conditionally calls both methods and it causes duplicate quota creating jobs.
Let's return right after calling create_quota_scope()

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• API server-client counterparts (e.g., manager API -> client SDK)

[graphite-app]

Your org has enabled the Graphite merge queue for merging into main

Add the label “flow:merge-queue” to the PR and Graphite will automatically add it to the merge queue when it’s ready to merge. Or use the label “flow:hotfix” to add to the merge queue as a hot fix.

You must have a Graphite account and log in to Graphite in order to use the merge queue. Sign up using this link.