feat(service_account): allow providing email when update a Service Account

mentioned in commit 4e266dbd

mentioned in merge request gitlab-org/cli!2607

mentioned in merge request gitlab-org/release-tools!4633

mentioned in merge request hojerdev/git-sync!72

mentioned in merge request gitlab-com/gl-infra/oncall-robot-assistant!110

mentioned in merge request schober-server/kubernetes/images/gitlab-token-refresher!37

mentioned in merge request fforster/epic-update!44

mentioned in merge request fforster/gitlab-mcp!211

mentioned in merge request gitlab-com/gl-infra/autolabels!137

mentioned in merge request gitlab-com/gl-infra/ringctl!405

mentioned in merge request gitlab-com/gl-infra/platform/runway/runwayctl!1412

mentioned in merge request sickit/token-operator!35

mentioned in merge request gitlab-com/gl-infra/woodhouse!738