Revert "[FollowIPH] Add follow IPH feature engagement condition"

This reverts commit 6fc34cf282787a5b49d0bb8aad39c5dc262add0e.

Reason for revert: crbug.com/1344026
Speculative revert for FeatureEngagementTestCase/testRequestDesktopTip failing on ios bots

Original change's description:
> [FollowIPH] Add follow IPH feature engagement condition
>
> - Call WouldTriggerHelpUI() to check if the IPH is eligible to show;
> - Set default feature config;
>
> Bug: 1340154
> Change-Id: Ia6d6e65f69e13488d802a431dcff9fa65ab5833d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3749090
> Commit-Queue: Tina Wang <tinazwang@chromium.org>
> Reviewed-by: Sergio Collazos <sczs@chromium.org>
> Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1023423}

Bug: 1340154
Change-Id: I7771faa37f76c20a9dacbdd34a2fb96f454e6c89
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3759684
Reviewed-by: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Keishi Hattori <keishi@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Keishi Hattori <keishi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1023565}