Use token-based authN for Usage Quota API

Vitaly Slobodinrequested to merge
vs/sub-client-add-token-quota-api into master

What does this MR do and why?

Use token-based authN for Usage Quota API

References

Related to https://gitlab.com/gitlab-org/modelops/applied-ml/code-suggestions/ai-assist/-/issues/1741#note_2945586732+

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