Implement changes to memberlist from feedback (#29029)

* Add a separator between joined and invited members

* Fix user label in tile having wrong color

* Changes to member tiles

- ThreePidInviteTile now contains an user label showing "(Invited)" and
  an email icon.
- RoomMemberTile now includes an icon similar to above.
- Refactors a bunch of code to make this change sensible.

* Remove redundant css code

* Fix tests

* Update src/components/viewmodels/memberlist/MemberListViewModel.tsx

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

* Update year in license

* Fix lint error

---------

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

res/css/views/rooms/_MemberTileView.pcss

@@ -31,9 +31,10 @@ Please see LICENSE files in the repository root for full details.
         min-width: 0;
     }
 
-    .mx_MemberTileView_user_label {
+    .mx_MemberTileView_userLabel {
         font: var(--cpd-font-body-sm-regular);
         font-size: 13px;
+        color: var(--cpd-color-text-secondary);
     }
 
     .mx_MemberTileView_avatar {
@@ -41,18 +42,4 @@ Please see LICENSE files in the repository root for full details.
         height: 32px;
         width: 32px;
     }
-
-    .mx_E2EIconView {
-        display: flex;
-        justify-content: center;
-        align-items: center;
-    }
-
-    .mx_E2EIconView_warning {
-        color: var(--cpd-color-icon-critical-primary);
-    }
-
-    .mx_E2EIconView_verified {
-        color: var(--cpd-color-icon-success-primary);
-    }
 }