Add config setting to set default User Setting for filter join/leave message (#24047)

* initial submit, join/leave message

* i18n-extract

* additional changes for client config

* add unit tests

* fix unit tests

* change tests to use string not bool

* more unit test fixes

* add and fix unit tests

* revert package-lock

* update unit tests

* Update default_config.ts

* fix unit test

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/platform/types/src/config.ts

@@ -70,6 +70,7 @@ export type ClientConfig = {
     EnableGifPicker: string;
     EnableGuestAccounts: string;
     EnableIncomingWebhooks: string;
+    EnableJoinLeaveMessageByDefault: string;
     EnableLatex: string;
     EnableInlineLatex: string;
     EnableLdap: string;