Update Gerrit permissions for global service users (built at http://cl/893733512)

Added permissions:
  Section [refs/heads/*]:
    Read:
      ALLOW: SLSA Policy Verification Service Accounts
    label-SLSA-Policy-Verified:
      ALLOW: SLSA Policy Verification Service Accounts

groups

diff --git a/groups b/groups
index af83daf..ea4d81d 100644
--- a/groups
+++ b/groups
@@ -1,5 +1,6 @@
 # UUID                                  	Group Name
 #
+19cb407985c62124c2fd1a496a1c90b9e2027f2f	SLSA Policy Verification Service Accounts
 746c50c1803469ed842a454112e8905cb2fc6ec0	dev
 global:Anonymous-Users                  	Anonymous Users
 global:Project-Owners                   	Project Owners

project.config

diff --git a/project.config b/project.config
index e6bc53e..39f69bb 100644
--- a/project.config
+++ b/project.config
@@ -35,6 +35,8 @@
 	submit = group mdb/rough-time-service-team
 	editTopicName = +force group Project Owners
 	editTopicName = +force group mdb/rough-time-service-team
+	label-SLSA-Policy-Verified = -1..+1 group SLSA Policy Verification Service Accounts
+	Read = group SLSA Policy Verification Service Accounts
 [access "refs/meta/config"]
 	exclusiveGroupPermissions = read
 	read = group Project Owners