[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

model/permission.go

@@ -25,6 +25,8 @@ var PERMISSION_CREATE_PUBLIC_CHANNEL *Permission
 var PERMISSION_CREATE_PRIVATE_CHANNEL *Permission
 var PERMISSION_MANAGE_PUBLIC_CHANNEL_MEMBERS *Permission
 var PERMISSION_MANAGE_PRIVATE_CHANNEL_MEMBERS *Permission
+var PERMISSION_CONVERT_PUBLIC_CHANNEL_TO_PRIVATE *Permission
+var PERMISSION_CONVERT_PRIVATE_CHANNEL_TO_PUBLIC *Permission
 var PERMISSION_ASSIGN_SYSTEM_ADMIN_ROLE *Permission
 var PERMISSION_MANAGE_ROLES *Permission
 var PERMISSION_MANAGE_TEAM_ROLES *Permission
@@ -209,6 +211,18 @@ func initializePermissions() {
 		"authentication.permissions.manage_private_channel_members.description",
 		PermissionScopeChannel,
 	}
+	PERMISSION_CONVERT_PUBLIC_CHANNEL_TO_PRIVATE = &Permission{
+		"convert_public_channel_to_private",
+		"authentication.permissions.convert_public_channel_to_private.name",
+		"authentication.permissions.convert_public_channel_to_private.description",
+		PermissionScopeChannel,
+	}
+	PERMISSION_CONVERT_PRIVATE_CHANNEL_TO_PUBLIC = &Permission{
+		"convert_private_channel_to_public",
+		"authentication.permissions.convert_private_channel_to_public.name",
+		"authentication.permissions.convert_private_channel_to_public.description",
+		PermissionScopeChannel,
+	}
 	PERMISSION_ASSIGN_SYSTEM_ADMIN_ROLE = &Permission{
 		"assign_system_admin_role",
 		"authentication.permissions.assign_system_admin_role.name",
@@ -933,6 +947,8 @@ func initializePermissions() {
 		PERMISSION_MANAGE_CHANNEL_ROLES,
 		PERMISSION_MANAGE_PUBLIC_CHANNEL_PROPERTIES,
 		PERMISSION_MANAGE_PRIVATE_CHANNEL_PROPERTIES,
+		PERMISSION_CONVERT_PUBLIC_CHANNEL_TO_PRIVATE,
+		PERMISSION_CONVERT_PRIVATE_CHANNEL_TO_PUBLIC,
 		PERMISSION_DELETE_PUBLIC_CHANNEL,
 		PERMISSION_DELETE_PRIVATE_CHANNEL,
 		PERMISSION_READ_CHANNEL,