Add userinfo-email OAuth2 scope when associating service account

[minhluantran017]

Background:

Service account associating with Jenkins agents provisioned by GCE plugin does not have the scope userinfo-email, which is suggested by official GKE docs to configure RBAC for the service account to deploy to GKE.

Proposal:

Add the userinfo-email OAuth2 scope beside current cloud-platform scope.

Github issue:

#476

Testing done

Local unit test passed using maven:3.8.6-openjdk-11:

[INFO] Results:
[INFO] 
[INFO] Tests run: 55, Failures: 0, Errors: 0, Skipped: 0
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  33:15 min
[INFO] Finished at: 2024-10-13T13:16:31Z
[INFO] ------------------------------------------------------------------------

[minhluantran017]

Hi @evandbrown , @craigdbarber , @jtnord , @olamy ,
As you are maintainers, are you the right persons for reviewing this PR?
Thanks.