FIX: ISX-1183 fixed and reenabled UITests for InputSystemUIInputModule.

[benoitalain]

Description

Jira ticket: https://jira.unity3d.com/browse/ISX-1138

Changes made

Fixed and re-enabled UITests.UI_CanOperateUIToolkitInterface_UsingInputSystemUIInputModule tests on Windows and MacOS.

My change is mainly to tick the "multiline" checkbox for the TextField, which makes the scrollview vertical scroller appear.

Testing

Ran the reactivated tests locally (on Windows).

Risk

I don't know why those tests have different results on different platforms. It's possible that my tests pass locally now but still fail on Yamato.

Checklist

Before review:

• [ ] Changelog entry added.
  • Explains the change in Changed, Fixed, Added sections.
  • For API change contains an example snippet and/or migration example.
  • JIRA ticket linked, example (case %%). If it is a private issue, just add the case ID without a link.
  • Jira port for the next release set as "Resolved".
• [ ] Tests added/changed, if applicable.
  • Functional tests Area_CanDoX, Area_CanDoX_EvenIfYIsTheCase, Area_WhenIDoX_AndYHappens_ThisIsTheResult.
  • Performance tests.
  • Integration tests.
• [ ] Docs for new/changed API's.
  • Xmldoc cross references are set correctly.
  • Added explanation how the API works.
  • Usage code examples added.
  • The manual is updated, if needed.

During merge:

• [ ] Commit message for squash-merge is prefixed with one of the list:
  • NEW: ___.
  • FIX: ___.
  • DOCS: ___.
  • CHANGE: ___.
  • RELEASE: 1.1.0-preview.3.

After merge:

• [ ] Create forward/backward port if needed. If you are blocked from creating a forward port now please add a task to ISX-1444.