[MM-31790] Support Packet Generation BACKEND (#16667)

* init commit

* clean up the code

* make mocks

* fix translations

* mocks and lint fixes

* add tests

* little fixes

* Update i18n/en.json

Co-authored-by: Scott Bishel <scott.bishel@mattermost.com>

* Update i18n/en.json

Co-authored-by: Scott Bishel <scott.bishel@mattermost.com>

* Update i18n/en.json

Co-authored-by: Scott Bishel <scott.bishel@mattermost.com>

* Update i18n/en.json

Co-authored-by: Scott Bishel <scott.bishel@mattermost.com>

* Update i18n/en.json

Co-authored-by: Scott Bishel <scott.bishel@mattermost.com>

* Address Comments

* fix i18n

* update api endpoint

* add enable file and file level for conditional show of banner

* Address Comments

* Make it more clear about returns

* Create zip file utility function

* update en.json

* address comments

* write tests

* check for data in test

* remove warning string

* Correct expected and actual

* set database through environment variables

* reset environment variable at end of test

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Scott Bishel <scott.bishel@mattermost.com>

testlib/testdata/mysql_migration_warmup.sql

@@ -35,6 +35,7 @@ INSERT INTO `Systems` VALUES ('add_use_group_mentions_permission', 'true');
 INSERT INTO `Systems` VALUES ('add_system_console_permissions', 'true');
 INSERT INTO `Systems` VALUES ('add_convert_channel_permissions', 'true');
 INSERT INTO `Systems` VALUES ('manage_shared_channel_permissions', 'true');
+INSERT INTO `Systems` VALUES ('Version', '5.31.0');
 
 
 /*!40000 ALTER TABLE `Systems` ENABLE KEYS */;