Revert "[iOS] Auto-deletion EGTests"

This reverts commit a3101aeee601d44e980f14c4a5981655276caeb6.

Reason for revert: New tests failing on 
 `Step "ios_chrome_ui_eg2tests_module iPad Pro (12.9-inch) (6th generation) 16.4 (retry shards) on Mac-14" failing on builder "chromium/ci/ios-simulator-noncq"`

Example failure: https://ci.chromium.org/ui/p/chromium/builders/ci/ios-simulator-noncq/59308/test-results?sortby=&groupby=

Bug: 390200553
Original change's description:
> [iOS] Auto-deletion EGTests
>
> In this CL, EGTests are added that the Auto-deletion IPH and action
> sheet.
>
> To share reused code, this CL migrates some function out of the
> download_manager_egtest file into a util file.
>
> Bug: 390200553
> Change-Id: I47a3f8b66707354da3409945890a579c5c352061
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6348157
> Reviewed-by: Gauthier Ambard <gambard@chromium.org>
> Auto-Submit: Daniel White <danieltwhite@google.com>
> Commit-Queue: Daniel White <danieltwhite@google.com>
> Cr-Commit-Position: refs/heads/main@{#1447764}

Bug: 390200553
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ib3eae8da0bfeffc6eab8bc8866dd16698a220ab4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6461746
Auto-Submit: Salma Elmahallawy <esalma@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Brad Triebwasser <btriebw@chromium.org>
Commit-Queue: Brad Triebwasser <btriebw@chromium.org>
Owners-Override: Salma Elmahallawy <esalma@google.com>
Cr-Commit-Position: refs/heads/main@{#1447860}