[flamegraph] Improve the coloring of ebpf profiles

[grafakus]

Feature description

Is your feature request related to a problem? Please describe.

The coloring is not the same when comparing a Python app instrumented with the SDK vs with ebpf:

SDK	ebpf
Playground link	Playground link

Describe the solution you'd like

The flame graphs produced should look alike

Alternatives considered

Describe alternatives you've considered

-

Additional context

Slack context: https://raintank-corp.slack.com/archives/C03NCLB4GG7/p1728494255393349?thread_ts=1728319358.278699&cid=C03NCLB4GG7

[grafakus]

cc @adamquan

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 90 days. It will be closed in 2 weeks if no further activity occurs.