Handle SDKContextClass client initialisation internally (#34146)

* Handle SDKContextClass `client` initialisation internally

Rather than via MatrixChat - this is predominantly for Lifecycle tests as they don't use a MatrixChat and it doesn't make much sense for this component to own this state.

* Fix tests

apps/web/test/unit-tests/stores/MemberListStore-test.ts

@@ -29,7 +29,7 @@ describe("MemberListStore", () => {
         const context = new TestSDKContext();
         client = stubClient();
         client.baseUrl = "https://invalid.base.url.here";
-        context.client = client;
+        context._client = client;
         store = new MemberListStore(context);
         // alice is joined to the room.
         room = new Room(roomId, client, client.getUserId()!);

apps/web/test/unit-tests/stores/RoomViewStore-test.ts

@@ -194,7 +194,7 @@ describe("RoomViewStore", function () {
         dis = new MatrixDispatcher();
         slidingSyncManager = new MockSlidingSyncManager();
         stores = new TestSDKContext();
-        stores.client = mockClient;
+        stores._client = mockClient;
         stores._SlidingSyncManager = slidingSyncManager;
         stores._PosthogAnalytics = new MockPosthogAnalytics();
         // @ts-expect-error

apps/web/test/unit-tests/stores/TypingStore-test.ts

@@ -30,7 +30,7 @@ describe("TypingStore", () => {
             sendTyping: jest.fn(),
         } as unknown as MatrixClient;
         const context = new TestSDKContext();
-        context.client = mockClient;
+        context._client = mockClient;
         typingStore = new TypingStore(context);
         jest.spyOn(SettingsStore, "getValue").mockImplementation((name: string) => {
             return name === "sendTypingNotifications";

apps/web/test/unit-tests/stores/widgets/WidgetPermissionStore-test.ts

@@ -54,7 +54,7 @@ describe("WidgetPermissionStore", () => {
         );
         mockClient = stubClient();
         const context = new TestSDKContext();
-        context.client = mockClient;
+        context._client = mockClient;
         widgetPermissionStore = new WidgetPermissionStore(context);
     });