K8SPS-340: fix gr-security-context test (#699)

https://perconadev.atlassian.net/browse/K8SPS-340

Author: pooknull

e2e-tests/tests/gr-security-context/04-assert.yaml

@@ -33,7 +33,6 @@ spec:
       containers:
       - command:
         - /opt/percona/run-backup.sh
-        image: perconalab/percona-server-mysql-operator:main-backup
         imagePullPolicy: Always
         name: xtrabackup
         resources: {}

e2e-tests/tests/gr-security-context/07-assert.yaml

@@ -5,8 +5,6 @@ timeout: 500
 apiVersion: batch/v1
 kind: Job
 metadata:
-  annotations:
-    batch.kubernetes.io/job-tracking: ""
   generation: 1
   labels:
     app.kubernetes.io/component: xtrabackup
@@ -26,7 +24,6 @@ spec:
       containers:
       - command:
         - /opt/percona/run-restore.sh
-        image: perconalab/percona-server-mysql-operator:main-backup
         imagePullPolicy: Always
         name: xtrabackup
         resources: {}