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 1731c35..8ec94b6 100644
--- a/groups
+++ b/groups
@@ -1,5 +1,6 @@
 # UUID                                                        	Group Name
 #
+63bde87f7337c8c48cb5732bd1023efd147cecd8                      	SLSA Policy Verification Service Accounts
 b15c340aa80bbf6266d54fe50c6c804b658bef3b                      	treehugger-robot
 global:Anonymous-Users                                        	Anonymous Users
 global:Project-Owners                                         	Project Owners

project.config

diff --git a/project.config b/project.config
index f877806..d7193b5 100644
--- a/project.config
+++ b/project.config
@@ -38,6 +38,8 @@
 	push = group mdb/hafnium-admin
 	submit = group Project Owners
 	submit = group mdb/hafnium-access
+	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
 	create = group Project Owners