fix: Do not retrieve the default SA principal when getting an access token #1839
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See b/458269866 for more information.
Retrieving the default SA principal was intended to help customers when getting credential info via
getCredentialInfo(). This introduced some behavior breaking changes internally. SincegetCredentialInfo()is intended to return info on a best-effort basis, users can callgetAccountmanually to get the default SA value.Reverts a few changes in #1791