Weird animation before the tab preview is displayed on `iOS 15.x.x`

[abodea]

Steps to reproduce

1. Launch FF.
2. Open more tabs.
3. Long press on any opened tab.
4. Expected behavior The animation when the preview is displayed should be
5. Actual behavior Weird animation before the tab preview is displayed on iOS 15.x.x
6. Device & build information

• Device: iPhone 13 Pro (15.7.1) / iPhone 14 (16.1).
• Build version: v9000 (29455).
• First seen version: N/A
  1. Notes Please note that on iOS 16.x.x it looks way better and smoother. Attachments:

The video for the issue from iOS 15.x.x

https://user-images.githubusercontent.com/42831109/224716627-7110c049-48b6-46ba-aa4d-4b952cb618a8.mov

Example to compare with iOS 16.x.x

https://user-images.githubusercontent.com/42831109/225741378-fe9e273e-e510-4173-a9ee-1b611e599618.mov

┆Issue is synchronized with this Jira Task

[dnarcese]

@abodea I can't tell a difference 😅 Can you explain where the difference is?

[abodea]

@abodea I can't tell a difference 😅 Can you explain where the difference is?

I'm sorry I might have gotten lost in too many attachments as I've sent them at the same time from my device. I updated the last video to reflect the iOS 16.x.x. I can add more tomorrow if needed with slow-motion.

[abodea]

https://github.com/mozilla-mobile/firefox-ios/assets/42831109/e20ffad8-660e-41aa-9f99-95e5c924c70d

Looks like now it's different from how it was in the previous videos.

This is a video with iOS 17 that is working properly.

https://github.com/mozilla-mobile/firefox-ios/assets/42831109/e5942ed3-0557-48af-bb64-a52a05b412f3

[github-actions[bot]]

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