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 b4fda65..746fcc8 100644
--- a/groups
+++ b/groups
@@ -1,7 +1,8 @@
-# UUID                 	Group Name
+# UUID                                  	Group Name
 #
-global:Anonymous-Users 	Anonymous Users
-global:Project-Owners  	Project Owners
-global:Registered-Users	Registered Users
-ldap:fuchsia-team      	ldap/fuchsia-team
-ldap:mojo-gob-admins   	ldap/mojo-gob-admins
+4cca1acc331877e2e2345e9bac6a47cc47b6ba05	SLSA Policy Verification Service Accounts
+global:Anonymous-Users                  	Anonymous Users
+global:Project-Owners                   	Project Owners
+global:Registered-Users                 	Registered Users
+ldap:fuchsia-team                       	ldap/fuchsia-team
+ldap:mojo-gob-admins                    	ldap/mojo-gob-admins

project.config

diff --git a/project.config b/project.config
index 0adb500..610ac28 100644
--- a/project.config
+++ b/project.config
@@ -34,6 +34,8 @@
 	submit = group ldap/mojo-gob-admins
 	editTopicName = +force group Project Owners
 	editTopicName = +force group ldap/mojo-gob-admins
+	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