Fix a bug in client archive_project method and fix lint in grpc auth

[randxie]

What this PR does / why we need it:

Fix bug in client.archive_project. It should use the core_service method instead of raw core_service_stub. Also fix lint in grpc/auth.py.

Does this PR introduce a user-facing change?:
NONE

Fix bug in client.archive_project and fix lint in grpc auth

[feast-ci-bot]

Hi @randxie. Thanks for your PR.

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[woop]

Thanks @randxie, remember to sign your commits please :)

[woop]

/ok-to-test

[woop]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: randxie, woop

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