Check if there is another marker that use the backtrace in the invalidated place

Before #2101 we were printing `First invalidated ..ms before...` text for every tracing markers that have cause field in marker tooltip. That's was wrong since it was also printing this text for non-styling markers. After that PR, I added this text to only `Styles` and `Reflow` markers but we still need to check and see if they are really only markers that have backtraces from the invalidated places(and not from the places that markers are generated).

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-169)