fix(auth): check disabled status on verifyIDToken

[Galadros]

The verifyIDToken() function checks to see whether the ID token is revoked, but never actually checks to see whether or not the user is disabled. This change makes it so that verifyIDToken() does check the disabled field by modifying checkRevoked(). The function is renamed to checkRevokedOrDisabled and now additionally includes a check to make sure that the user is not disabled. A new authErrorCode corresponding to this case is added. verifySessionCookie() is slightly modified to account for the fact that checkRevokedOrDisabled now returns 3 values instead of 2. verifyIDToken() has been modified to raise an InvalidArgument error with authErrorCode of "ID_TOKEN_DISABLED" if the user is disabled.

[hiranya911]

Pointed out a several things that need to change. Please change the base branch of the PR to dev. We don't directly merge to master on this repo.

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[Galadros]

I'm not sure how to fix the google-cla bot error. It's complaining that "google-oss-bot" doesn't have a CLA signed.

[hiranya911]

You might want to rebase your commits at dev and do a force push, which should clean up the commit history.

[hiranya911]

Thanks for the changes. But the checkRevokedOrDisabled() helper function could use more work. We also need an integration test or two.

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[hiranya911]

Looks mostly good. Just a few minor things that can be added as improvements.

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[hiranya911]

LGTM with a comment about testing. Highly recommend adding the missing test case before merging.

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