Revert "[tab group v2] Add Everything menu"

This reverts commit 07fa0e70b30897ea30b4066919dffe71da659b84.

Reason for revert: Newly added test is failing: SavedTabGroupEverythingMenu/STGEverythingMenuUnitTest.TabGroupItemsSortedByCreationTime/


Original change's description:
> [tab group v2] Add Everything menu
>
> For now the menu is invoked by pressing the Everything button. The menu
> is gated by V2 flag.
>
> UI demo:
> https://screenshot.googleplex.com/4BZdt9UR6QU3g8Z.png
>
> Change-Id: I3e43f2cc9407162abb6372560ed5a5530005c787
> Bug: 331663683
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5393600
> Reviewed-by: David Pennington <dpenning@chromium.org>
> Commit-Queue: pengchao Cai <pengchaocai@chromium.org>
> Reviewed-by: David Trainor <dtrainor@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1281353}

Bug: 331663683
Change-Id: Ib455743fcc4ca58725b0d9b1d8c8e7fae2e42ab7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5418498
Owners-Override: Fergal Daly <fergal@google.com>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Auto-Submit: Fergal Daly <fergal@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1281692}