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>

server/config/diff_test.go

@@ -807,9 +807,6 @@ func TestDiff(t *testing.T) {
 						"com.mattermost.nps": {
 							Enable: !defaultConfigGen().PluginSettings.PluginStates["com.mattermost.nps"].Enable,
 						},
-						"com.mattermost.apps": {
-							Enable: true,
-						},
 						"com.mattermost.calls": {
 							Enable: true,
 						},
@@ -839,9 +836,6 @@ func TestDiff(t *testing.T) {
 						"com.mattermost.newplugin": {
 							Enable: true,
 						},
-						"com.mattermost.apps": {
-							Enable: true,
-						},
 						"com.mattermost.calls": {
 							Enable: true,
 						},
@@ -863,9 +857,6 @@ func TestDiff(t *testing.T) {
 					Path:    "PluginSettings.PluginStates",
 					BaseVal: defaultConfigGen().PluginSettings.PluginStates,
 					ActualVal: map[string]*model.PluginState{
-						"com.mattermost.apps": {
-							Enable: true,
-						},
 						"com.mattermost.calls": {
 							Enable: true,
 						},