Remove additional minutes when no minutes purchased

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

ee/app/views/namespaces/pipelines_quota/_extra_shared_runners_minutes_quota.html.haml

 - return unless Gitlab.com?
 
 - minutes_quota = namespace.ci_minutes_quota
-- return unless minutes_quota.enabled?
+- return unless minutes_quota.enabled? && minutes_quota.purchased_minutes_report.limit > 0
 
 .row
   .col-sm-6

ee/changelogs/unreleased/327458-ci-minutes-ee.yml

+---
+title: Remove additional minutes when no minutes purchased
+merge_request: 59112
+author: Takuya Noguchi
+type: changed