This CL refactors Heap::GCTypeTimer and Heap::GCTypePriorityTimer
and moves them to a GCTracer::RecordGCPhasesInfo class. This is
a necessary change for deprecating counters that are used for
old style GC metrics, like gc_scavenger. When all such counters
are deprecated, GCTracer::RecordGCPhasesInfo will no longer be
necessary and will be removed.

Bug: chromium:1154636
Change-Id: I04504a0f6c7a0955f4300a1c94c969aaeb23b77f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3486556Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Nikolaos Papaspyrou <nikolaos@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79257}