MM-53029 - Remove default (true) for channelExport and Apps plugin (#23682)

* remove default (true) for channelExport and Apps plugin

* readd constant, still used

* more cleanup of constants

* revert usage, constants changes

* update tests expecting Apps on by default

* remove defaults from tests

* revert package-lock.json

---------

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

e2e-tests/playwright/support/server/default_config.ts

@@ -618,9 +618,6 @@ const defaultServerConfig: AdminConfig = {
         ClientDirectory: './client/plugins',
         Plugins: {},
         PluginStates: {
-            'com.mattermost.apps': {
-                Enable: true,
-            },
             'com.mattermost.calls': {
                 Enable: true,
             },