Move checks mail soy templates to unique namespaces

For the rationale, see https://gerrit-review.googlesource.com/c/gerrit/+/301106

Change-Id: I3367ed4f5adca4903016f9b8d0bb388be5fa89d0
diff --git a/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdated.soy b/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdated.soy
index 5e914ed..cd57453 100644
--- a/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdated.soy
+++ b/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdated.soy
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-{namespace com.google.gerrit.server.mail.template}
+{namespace com.google.gerrit.server.mail.template.CombinedCheckStateUpdated}
 
 /**
  * The .CombinedCheckStateUpdated template will determine the contents of the email related to a
diff --git a/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdatedHtml.soy b/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdatedHtml.soy
index 4c70315..0f35c40 100644
--- a/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdatedHtml.soy
+++ b/resources/com/google/gerrit/plugins/checks/email/CombinedCheckStateUpdatedHtml.soy
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-{namespace com.google.gerrit.server.mail.template}
+{namespace com.google.gerrit.server.mail.template.CombinedCheckStateUpdatedHtml}
 
 import * as mailTemplate from 'com/google/gerrit/server/mail/Private.soy';