MM-57377: Skip racy test (#26534)

https://mattermost.atlassian.net/browse/MM-57377
```release-note
NONE
```

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/server_test.go

@@ -304,6 +304,7 @@ func checkEndpoint(t *testing.T, client *http.Client, url string) error {
 }
 
 func TestPanicLog(t *testing.T) {
+	t.Skip("MM-57377")
 	// Creating a temp dir for log
 	tmpDir, err := os.MkdirTemp("", "mlog-test")
 	require.NoError(t, err, "cannot create tmp dir for log file")