Upgrading to latest perfetto build caused severe performance regression

[kenzieschmoll]

Culprit that caused the regression: https://github.com/flutter/devtools/pull/7445

After speaking with @stevegolton on the Perfetto team, the hypothesis is that this was caused by plugin initialization added in https://github.com/google/perfetto/commit/24a0d91beab59e22c1f1e0d720e3cdb417796f55 (first included in v36.0).

Immediate action:

• [ ] Roll back our perfetto build to avoid the regression.
  • EDIT: I was able to use v34.0 with a local patch to include https://android-review.git.corp.google.com/c/platform/external/perfetto/+/3015413
    • see https://github.com/flutter/devtools/pull/7480

Longer term action:

• work with the Perfetto team to see if we can avoid expensive initialization on each trace load.

[kenzieschmoll]

Lowering priority now that the performance regression has been fixed.