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This PR hides the system highlights in iOS 16 (except when scribble is enabled).
Note that auto correction highlight is still drawn by flutter, so it still works.
I don't think we need to CP this, since it's iOS 16 only, and iOS 17 is already out.
## Why not use system highlight?
Unlike iOS 17, the iOS 16 system highlight only respect the width provided by `firstRectForRange`, but not the height. I have audited all sizing related APIs in UITextInput (doc [here](https://developer.apple.com/documentation/uikit/uitextinput#1653155)), specifically, `firstRect(for:)`, `caretRect(for:)` and `selectionRects(for:)`, and they all return the correct height.
## About scribble
The initial implementation of `firstRectForRange` (that returns the first selection rect) was introduced for the scribble feature on iPad (code [here](1d3165a31c (diff-4c7b102c0690b8ec5e2212b079f5d69fe3f816c84e47ce94bc7bc89312f39e40R1487-R1505))).
It turns out that a non-zero rect is required for scribble's advanced feature to work (e.g. inserting a space with a vertical bar). So we can't apply this fix for scribble.
*List which issues are fixed by this PR. You must list at least one issue.*
Fixes https://github.com/flutter/flutter/issues/136802
*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style