[MM-19880] Limit size of file inside Zip archive before JSON parsing for Slack Import (#12514)

* Limit size of files inside Zip archive before JSON parsing for Slack import

* Use specific log message when skipping file in Slack import zip due to size

* Updated max size for slack import

i18n/en.json

@@ -1878,6 +1878,10 @@
     "id": "api.slackimport.slack_import.zip.app_error",
     "translation": "Unable to open the Slack export zip file.\r\n"
   },
+  {
+    "id": "api.slackimport.slack_import.zip.file_too_large",
+    "translation": "{{.Filename}} in zip archive too large to process for Slack import\r\n"
+  },
   {
     "id": "api.status.user_not_found.app_error",
     "translation": "User not found"