fix(auth): Set emulator credentials when using the Auth emulator #734
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If
FIREBASE_AUTH_EMULATOR_HOSTenv var is set the SDK shouldn't connect to Auth servers for OAuth2 handshake. This PR sets the emulator credentials when emulator mode is set.b/220373445
RELEASE NOTE: Fixed an issue in the Auth API to correctly set the emulator credentials when the
FIREBASE_AUTH_EMULATOR_HOSTenvironment variable is set to point to the emulator Auth endpoint.