MM-62079: Using a cache prefix to isolate cache keys for each test (#30261)

```release-note
A new config setting CacheSettings.RedisCachePrefix has been added which can be used to add a prefix to all Redis cache keys.
```

server/channels/api4/post_test.go

@@ -131,7 +131,6 @@ func TestCreatePost(t *testing.T) {
 	})
 
 	t.Run("Create posts without the USE_CHANNEL_MENTIONS Permission - returns ephemeral message with mentions and no ephemeral message without mentions", func(t *testing.T) {
-		t.Skip("MM-62764")
 		wsClient := th.CreateConnectedWebSocketClient(t)
 
 		defaultPerms := th.SaveDefaultRolePermissions()
@@ -188,7 +187,6 @@ func TestCreatePost(t *testing.T) {
 				}
 			case <-timeout:
 				require.Fail(t, fmt.Sprintf("Got %d ephemeral messages, expected: %d", gotEvents, expectedEvents))
-				break
 			}
 		}
 	})