Nothing is displayed when zooming between two samples

From @julienw's comment on #3319:

> I still found an issue when zooming in between 2 samples:
> 1. [start from this link](https://profiler.firefox.com/public/07ssba14pm3vnacv8fcfjtnnban4hwvfqxzag90/calltree/?globalTrackOrder=12-0-1-2-3-4-5-6-7-8-9-10-11&hiddenGlobalTracks=1-2-3-4-5-6-7-8-9-10-12&localTrackOrderByPid=36639-2-3-0-1~36653-0~36646-0~36649-0~36650-0~36664-0~36648-0~39224-0~36652-0~39238-0~36651-0~39254-0-1~&range=3438m650~3438m202~3438m56~3456004u8979~3463089u1035&thread=0&timelineType=cpu-category&v=5)
> 2. Select and commit a range between the 2 samples.
>
> => then nothing is displayed, but I believe we should still see something?

I agree that normally we should still be able to see the previous and next sample, even though these samples are not exactly inside the time range.
This wasn't possible before because we were directly using the filtered thread to the activity graph. But now, we are also sending the full thread to the activity graph. This should now be possible to render the samples even though they are not exactly in the view.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-392)

Reproduce the issue from the linked profiler profile by selecting and committing a range between two samples. Start with the activity graph's handling of the full thread and selected time range; done means the previous and next samples are still rendered when they fall just outside the range.

Written by the indexing model from the issue text.