Expose SDKContext on the window & avoid using singleton store .instance (#34098)

* Expose SDKContextClass via window for debugging

* Remove stores from window if they are exposed via sdkContext

* Avoid usages of global store instance where React context is accessible

* Fix tests by adding SDKContext.Provider

* Fix tests by adding SDKContext.Provider

* Fix tests by adding SDKContext.Provider

* Fix tests by adding SDKContext.Provider

* Iterate

* Discard changes to apps/web/src/components/views/elements/AppTile.tsx

apps/web/test/unit-tests/components/views/rooms/MessageComposer-test.tsx

@@ -37,6 +37,8 @@ import { Action } from "../../../../../src/dispatcher/actions";
 import { ScopedRoomContextProvider } from "../../../../../src/contexts/ScopedRoomContext.tsx";
 import { TimelineRenderingType, type RoomContextType } from "../../../../../src/contexts/RoomContext.ts";
 import { RoomUploadContextProvider } from "../../../../../src/viewmodels/room/RoomUploadViewModel.tsx";
+import { SDKContext } from "../../../../../src/contexts/SDKContext.ts";
+import { SDKContextClass } from "../../../../../src/contexts/SDKContextClass.ts";
 
 const openStickerPicker = async (): Promise<void> => {
     await userEvent.click(screen.getByLabelText("More options"));
@@ -469,13 +471,15 @@ function wrapAndRender(
     };
 
     const getRawComponent = (props = {}, context = roomContext, client = mockClient) => (
-        <MatrixClientContext.Provider value={client}>
-            <ScopedRoomContextProvider {...context}>
-                <RoomUploadContextProvider>
-                    <MessageComposer {...defaultProps} {...props} />
-                </RoomUploadContextProvider>
-            </ScopedRoomContextProvider>
-        </MatrixClientContext.Provider>
+        <SDKContext.Provider value={SDKContextClass.instance}>
+            <MatrixClientContext.Provider value={client}>
+                <ScopedRoomContextProvider {...context}>
+                    <RoomUploadContextProvider>
+                        <MessageComposer {...defaultProps} {...props} />
+                    </RoomUploadContextProvider>
+                </ScopedRoomContextProvider>
+            </MatrixClientContext.Provider>
+        </SDKContext.Provider>
     );
     return {
         rawComponent: getRawComponent(props, roomContext, mockClient),