[TimelinePanel] Clear timer before removing the StatusPane
[TimelinePanel] Clear timer before removing the StatusPane

This stops the timer before we remove the status pane. Otherwise the
timer would trigger an update to the status pane based on its parent,
although this element has already been removed from the DOM.

Also, rename 'hide' to 'remove' as this is what this method is
doing.

Fixed: chromium:1223418, chromium:1255679
Change-Id: Iac7496db7bba6ab352ad47925bea5e2bff9ac7a1
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3327241
Reviewed-by: Benedikt Meurer <024a1e0af501338d11c3b837c6193d11c140d792@chromium.org>
Commit-Queue: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>

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