Disable jobs cleanup cronjob if gitOps is disabled (#3129)

This skips the cronjob responsible for cleaning up `fleet apply`
Kubernetes jobs when no such jobs have run because Fleet has been
installed with gitOps disabled.

charts/fleet/templates/job_cleanup_gitrepojobs.yaml

@@ -1,4 +1,4 @@
-{{- if .Values.migrations.gitrepoJobsCleanup }}
+{{- if and .Values.migrations.gitrepoJobsCleanup .Values.gitops.enabled }}
 ---
 apiVersion: batch/v1
 kind: CronJob