Check the counter track activity to decide if it should be visible

There is [_isLocalTrackVisible](https://github.com/firefox-devtools/profiler/blob/main/src/profile-logic/tracks.ts#L1767) method where we decide if a local track should be visible. We want to add an activity check there for the counter tracks to base this decision on. As @canova [wrote](https://github.com/firefox-devtools/profiler/pull/5944#discussion_r3124709708):

> I think this is something we might want to do for all the counters. Or have another counter display option like `showOnlyWhenActive: true`.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-1265)