[REF] mail: move discuss core files to core folder

This prevents from having files floating in the root folder and making
the navigation between subfolders more complex.

Part of task-3265211

closes odoo/odoo#123344

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/discuss/core/discuss_patch.js

@@ -1,8 +1,8 @@
 /* @odoo-module */
 
-import { CallSettings } from "@mail/discuss/call_settings";
-import { ChannelInvitation } from "@mail/discuss/channel_invitation";
-import { ChannelMemberList } from "@mail/discuss/channel_member_list";
+import { CallSettings } from "@mail/discuss/core/call_settings";
+import { ChannelInvitation } from "@mail/discuss/core/channel_invitation";
+import { ChannelMemberList } from "@mail/discuss/core/channel_member_list";
 import { Discuss } from "@mail/discuss_app/discuss";
 import { useRef } from "@odoo/owl";
 import { usePopover } from "@web/core/popover/popover_hook";

addons/mail/static/src/discuss/web/chat_window_patch.js

@@ -1,8 +1,8 @@
 /* @odoo-module */
 
-import { CallSettings } from "@mail/discuss/call_settings";
-import { ChannelInvitation } from "@mail/discuss/channel_invitation";
-import { ChannelMemberList } from "@mail/discuss/channel_member_list";
+import { CallSettings } from "@mail/discuss/core/call_settings";
+import { ChannelInvitation } from "@mail/discuss/core/channel_invitation";
+import { ChannelMemberList } from "@mail/discuss/core/channel_member_list";
 import { ChatWindow } from "@mail/web/chat_window/chat_window";
 import { patch } from "@web/core/utils/patch";
 import { _t } from "@web/core/l10n/translation";