Consider adding a "Show all tracks of this process" option

When capturing all threads (e.g. when doing exploratory profiling), it can be time consuming to enable the visibility of _all_ threads for the chosen process.

This feature request is to consider adding a "Show all tracks of this process" item to the process context menu.
(Or possibly there is another spot to add this).

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-445)