Add support for space rooms on the JoinRoomScreen. (#4582)

* Add support for space rooms to JoinRoomScreenModel.

* Make a single wrapper type for JoinRoomScreen previews to simplify instantiation.

* Add previews for JoinRoomScreen for spaces.

AccessibilityTests/Sources/GeneratedAccessibilityTests.swift

@@ -227,10 +227,18 @@ extension AccessibilityTests {
         try await performAccessibilityAudit(named: "JoinRoomByAddressView_Previews")
     }
 
+    func testJoinRoomScreenSpace() async throws {
+        try await performAccessibilityAudit(named: "JoinRoomScreenSpace_Previews")
+    }
+
     func testJoinRoomScreen() async throws {
         try await performAccessibilityAudit(named: "JoinRoomScreen_Previews")
     }
 
+    func testJoinedMembersBadgeView() async throws {
+        try await performAccessibilityAudit(named: "JoinedMembersBadgeView_Previews")
+    }
+
     func testKnockRequestCell() async throws {
         try await performAccessibilityAudit(named: "KnockRequestCell_Previews")
     }