MM-21552: Adding SaveMultiple to posts (#13766)

* Adding SaveMultiple to posts

* Improving tests

* fixing i18n

* Fixing tests

* Improving testing on top of Save and SaveMultiple

* Fixing shadow variables

* Addressing some PR comments

* More clear update post test

* Addressing some PR comments

* Addressing some PR comments and simplifying the code

* Improting replies in bulk too

* Fixing reply count and processing last imported replies

* Adding OverwriteMultiple to posts aggregating everything in the same transaction

* Adding 2 pending tests to implement

* Adding tests for overwrite multiple posts

* Adding tests for TeamStore.GetByNames method

* Fixing shadow variables

* Addressing PR comments

* Extracting i18n strings

* Fixing tests

* Fixing tests

* Adding more test cases

* Using a variable instead of a fake timestamp

i18n/en.json

@@ -2958,6 +2958,14 @@
     "id": "app.import.emoji.bad_file.error",
     "translation": "Error reading import emoji image file. Emoji with name: \"{{.EmojiName}}\""
   },
+  {
+    "id": "app.import.get_teams_by_names.some_teams_not_found.error",
+    "translation": "Some teams not found"
+  },
+  {
+    "id": "app.import.get_users_by_username.some_users_not_found.error",
+    "translation": "Some users not found"
+  },
   {
     "id": "app.import.import_channel.scheme_deleted.error",
     "translation": "Unable to set a channel to use a deleted scheme."
@@ -2978,18 +2986,10 @@
     "id": "app.import.import_direct_channel.create_group_channel.error",
     "translation": "Failed to create group channel"
   },
-  {
-    "id": "app.import.import_direct_channel.member_not_found.error",
-    "translation": "Could not find channel member when importing direct channel"
-  },
   {
     "id": "app.import.import_direct_channel.update_header_failed.error",
     "translation": "Failed to update direct channel header"
   },
-  {
-    "id": "app.import.import_direct_post.channel_member_not_found.error",
-    "translation": "Could not find channel member when importing direct channel post"
-  },
   {
     "id": "app.import.import_direct_post.create_direct_channel.error",
     "translation": "Failed to get direct channel"
@@ -2998,14 +2998,6 @@
     "id": "app.import.import_direct_post.create_group_channel.error",
     "translation": "Failed to get group channel"
   },
-  {
-    "id": "app.import.import_direct_post.save_preferences.error",
-    "translation": "Error importing direct post. Failed to save preferences."
-  },
-  {
-    "id": "app.import.import_direct_post.user_not_found.error",
-    "translation": "Post user does not exist"
-  },
   {
     "id": "app.import.import_line.null_channel.error",
     "translation": "Import data line has type \"channel\" but the channel object is null."
@@ -3050,10 +3042,6 @@
     "id": "app.import.import_post.save_preferences.error",
     "translation": "Error importing post. Failed to save preferences."
   },
-  {
-    "id": "app.import.import_post.team_not_found.error",
-    "translation": "Error importing post. Team with name \"{{.TeamName}}\" could not be found."
-  },
   {
     "id": "app.import.import_post.user_not_found.error",
     "translation": "Error importing post. User with username \"{{.Username}}\" could not be found."
@@ -6982,6 +6970,14 @@
     "id": "store.sql_team.get_by_name.missing.app_error",
     "translation": "Unable to find the existing team."
   },
+  {
+    "id": "store.sql_team.get_by_names.app_error",
+    "translation": "Unable to get the teams by names"
+  },
+  {
+    "id": "store.sql_team.get_by_names.missing.app_error",
+    "translation": "Unable to find some of the requested teams"
+  },
   {
     "id": "store.sql_team.get_by_scheme.app_error",
     "translation": "Unable to get the channels for the provided scheme."