feat(google): preserve signer identity in token credentials - #855
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Token credentials issued for known service accounts currently discard the signer identity, forcing consumers to duplicate the service account email before query signing.
Preserve provider-discovered signer emails on Google token credentials and use them for IAMCredentials
signBlobquery signing. An explicitRequestSigner::with_signer_emailtakes precedence, providers that cannot determine an identity retain the explicit configuration path, and Bearer authentication ignores the query-signing identity.Closes #854