This cleanup CL adds a timeline property to ic-panel and directly
assigns the logEvents to selectedLogEvents upon data load.

Bug: v8:10644

Change-Id: Ic1707ea237abbf57417c0b14e24fc0bf797d9679
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2370627Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Zeynep Cankara <zcankara@google.com>
Cr-Commit-Position: refs/heads/master@{#69535}