On a profile with memory tracking captured, multiple UI/UX bugs on selecting a timerange (blank tooltip, disappearing marker on graph, slow selection)

Moved from bug-1915331:

STR1 (Empty stacks area in graph with datasource option except "Timings" selected)

> Open this profile: https://share.firefox.dev/3T54yXj
> -> This profile had memory tracking enabled. In the "Call Tree" tab, the "DataSource" is anything except "Timings")
> AR: The area under the black line is empty . If you select the whole range, you wil see that the whole area should have been yellow.

STR2: (No hover tooltips on markers)

> Open the same profile but a different range selected: https://share.firefox.dev/4dFmsYK
> Hover mouse over the Javascript yellow area
> AR: No tooltip is observed.

STR3 (Slow timerange selection with "Deallocated memory" selected)

> Open the same profile but will the full time range: https://share.firefox.dev/4cEhGcZ
> Select a time range that includes portions of the profile with markers
> AR: The selection is slow : https://share.firefox.dev/3X2a5Pu

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-806)