fix(ionic): Add workaround for Ionic WebView plugin

[dpogue]

Platforms affected

iOS

Motivation and Context

Closes GH-1631.

Description

Re-add an implementation of the deprecated shouldOverrideLoadWithRequest:navigationType: selector because the Ionic WebView plugin relies on it.

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• 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.
✅ Project coverage is 80.21%. Comparing base (6a130fd) to head (62ccdd7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1632   +/-   ##
=======================================
  Coverage   80.21%   80.21%           
=======================================
  Files          18       18           
  Lines        5312     5312           
=======================================
  Hits         4261     4261           
  Misses       1051     1051           

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