[WEB-5559] improvement: chat support functionality and remove Intercom provider (#8217)

* [WEB-5559] improve: chat support functionality and remove Intercom provider

- Added ChatSupportModal component for chat support integration.
- Replaced IntercomProvider with ChatSupportModal in AppProvider.
- Introduced useChatSupport hook to manage chat support state and actions.
- Updated help commands to utilize chat support instead of Intercom.
- Removed obsolete Intercom-related components and hooks.

* refactor: lazy load ChatSupportModal in AppProvider

apps/web/core/custom-events/chat-support.ts

@@ -0,0 +1,13 @@
+type ChatSupportType = "open";
+
+type ChatSupportEventType = `chat-support:${ChatSupportType}`;
+
+export const CHAT_SUPPORT_EVENTS = {
+  open: "chat-support:open",
+} satisfies Record<ChatSupportType, ChatSupportEventType>;
+
+export class ChatSupportEvent extends CustomEvent<ChatSupportType> {
+  constructor(type: ChatSupportType) {
+    super(CHAT_SUPPORT_EVENTS[type]);
+  }
+}