Remove redundant default scopes

[modular-magician]

Fixes hashicorp/terraform-provider-google#8031

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provider: removed redundant default scopes. The provider's default scopes when authenticating with credentials are now exclusively "https://www.googleapis.com/auth/cloud-platform" and "https://www.googleapis.com/auth/userinfo.email".

Derived from GoogleCloudPlatform/magic-modules#5343