[MM-27274] Add permission to convert public channel to private (#15370)

* Add permission to convert public channel to private

* Rename to PERMISSION_CONVERT_PUBLIC_CHANNEL_TO_PRIVATE

* Fix tests

* Update definitions for roles that have manage_team

* Fix tests

* Add convert private channel to public permission

* Add to channel scoped perms

* Update permission checks on channel privacy endpoint

* Trigger CI

app/app_test.go

@@ -152,6 +152,8 @@ func TestDoAdvancedPermissionsMigration(t *testing.T) {
 			model.PERMISSION_MANAGE_OTHERS_SLASH_COMMANDS.Id,
 			model.PERMISSION_MANAGE_INCOMING_WEBHOOKS.Id,
 			model.PERMISSION_MANAGE_OUTGOING_WEBHOOKS.Id,
+			model.PERMISSION_CONVERT_PUBLIC_CHANNEL_TO_PRIVATE.Id,
+			model.PERMISSION_CONVERT_PRIVATE_CHANNEL_TO_PUBLIC.Id,
 			model.PERMISSION_DELETE_POST.Id,
 			model.PERMISSION_DELETE_OTHERS_POSTS.Id,
 		},
@@ -277,6 +279,8 @@ func TestDoAdvancedPermissionsMigration(t *testing.T) {
 			model.PERMISSION_MANAGE_OTHERS_SLASH_COMMANDS.Id,
 			model.PERMISSION_MANAGE_INCOMING_WEBHOOKS.Id,
 			model.PERMISSION_MANAGE_OUTGOING_WEBHOOKS.Id,
+			model.PERMISSION_CONVERT_PUBLIC_CHANNEL_TO_PRIVATE.Id,
+			model.PERMISSION_CONVERT_PRIVATE_CHANNEL_TO_PUBLIC.Id,
 			model.PERMISSION_MANAGE_PUBLIC_CHANNEL_PROPERTIES.Id,
 			model.PERMISSION_MANAGE_PRIVATE_CHANNEL_PROPERTIES.Id,
 			model.PERMISSION_DELETE_POST.Id,
@@ -429,6 +433,8 @@ func TestDoEmojisPermissionsMigration(t *testing.T) {
 		model.PERMISSION_REMOVE_REACTION.Id,
 		model.PERMISSION_USE_CHANNEL_MENTIONS.Id,
 		model.PERMISSION_USE_GROUP_MENTIONS.Id,
+		model.PERMISSION_CONVERT_PUBLIC_CHANNEL_TO_PRIVATE.Id,
+		model.PERMISSION_CONVERT_PRIVATE_CHANNEL_TO_PUBLIC.Id,
 	}
 	sort.Strings(expected2)
 	sort.Strings(role2.Permissions)