Restore old tab tray animation

[kylehickinson]

Description:

We recently refactored the tab tray and replaced the presentation animation with a standard sheet. Feedback suggests that users liked the old version better and so we should restore the transform-style animation

[iccub]

Copying over improvement suggestions from the pull request

Improvements that could happen: Instead of taking a screenshot of the NTP/web page we should use the actual BVC and do scale + anchorPoint animations so that we are safer from screenshot & final view not matching causing a slight mismatch.

[Uni-verse]

Verification PASSED on iPhone 12 Pro running iOS 15.1.1 using build version 1.35 (22.1.14.22)

• Verified transform-style animation is applied to tab tray

Test Scenarios (for each device)

• Access the tab tray as usual from the browser
• Add new tabs until the number of tabs exceeds the on-screen space
• Verify that tabs transform correctly even when the tab would be off-screen initially (and vice-versa tapping on a partially off-screen tab, or tapping done while selected tab is off-screen)
• Verify private mode acts as normal
• Verify removing all tabs acts as normal

RPReplay_Final1642556890.MP4

Verification PASSED on iPhone X running iOS 14.4.2 using build version 1.35 (22.1.14.22)

RPReplay_Final1642556630.MP4

Verification PASSED on iPad (7th Gen) running iPadOS 14.4.2 using build version 1.35 (22.1.14.22)