- Start moving profiler scripts to tools/profiling
- Add linux-perf-d8.py wrapper script that runs `perf record` and
  `perf inject`
- Improve waiting for the d8/chrome process and allow for early
  termination if --timeout is provided
- Allow fractional seconds for --timeout
- Delete run-perf.sh and provide equivalent functionality in
  linux-perf-d8.py

Change-Id: Iac1d6cf895aa7159a9bbb387aca7632df27a0ca3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3585951Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79991}