refactor!: Remove scrollView category extension on UIView

[dpogue]

🚨 BREAKING API CHANGE! This should be tested with all the core plugins, just in case any of them are relying on this API existing.

Platforms affected

iOS

Motivation and Context

As mentioned in #1399, this API was added as a compatibility shim at the time we supported both UIWebView and WKWebView, when WKWebView did not expose a public scrollView property. That property was made available in iOS 8, and this extension now risks causing problems due to being applied globally to all UIView subclasses.

Closes #1399.

Description

Remove the category extension to expose a scrollView property on all UIView object instances.

Testing

...

Checklist

• [x] I've run the tests to see all new and existing tests pass
• [ ] I added automated test coverage as appropriate for this change
• [x] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (92017bb) 78.25% compared to head (f7d069d) 78.25%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1400 +/- ## ======================================= Coverage 78.25% 78.25% ======================================= Files 15 15 Lines 1789 1789 ======================================= Hits 1400 1400 Misses 389 389 ```

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