[MM-32691] - Send email when the users are not able to join a workspace (#16958)

* [MM-32691] - Send email when the users are not able to join a workspace

* Revert "[MM-32691] - Send email when the users are not able to join a workspace"

This reverts commit 3c11643c7c6867d992743a15675f0099df4f4e4d.

* Feeback impl-1

* use date as key for rate limiting

* Fix tests

* Translations

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

i18n/en.json

@@ -3006,6 +3006,10 @@
     "id": "api.templates.upgrade_request_info4",
     "translation": "Because your workspace has reached the user limit for the free version of Mattermost cloud, invitations cannot be sent. Upgrade now to allow more users to join your workspace."
   },
+  {
+    "id": "api.templates.upgrade_request_info4_2",
+    "translation": "Someone recently tried to join your workspace but was unable to as your workspace has reached the user limit for the free version of Mattermost cloud. Upgrade now to allow more users to join your workspace."
+  },
   {
     "id": "api.templates.upgrade_request_subject",
     "translation": "Mattermost user request upgrade of workspace"
@@ -3014,6 +3018,10 @@
     "id": "api.templates.upgrade_request_title",
     "translation": "{{ .UserName }} would like to invite members to your workspace"
   },
+  {
+    "id": "api.templates.upgrade_request_title2",
+    "translation": "New users are unable to join your workspace"
+  },
   {
     "id": "api.templates.user_access_token_body.info",
     "translation": "A personal access token was added to your account on {{ .SiteURL }}. They can be used to access {{.SiteName}} with your account."
@@ -6442,10 +6450,6 @@
     "id": "ent.elasticsearch.not_started.error",
     "translation": "Elasticsearch is not started"
   },
-  {
-    "id": "ent.elasticsearch.post.get_files_batch_for_indexing.error",
-    "translation": "Unable to get the files batch for indexing."
-  },
   {
     "id": "ent.elasticsearch.post.get_posts_batch_for_indexing.error",
     "translation": "Unable to get the posts batch for indexing."