Fix view bad insert index

[texaclou]

Fixes #4465

PR Type

What kind of change does this PR introduce?

Bugfix

What is the current behavior?

When ACV (AdvancedCollectionView) use a filter
When ACV don't use SortDescription
When a new item is inserted at the end of the source
Then new item is inserted in view before the last item.

What is the new behavior?

Now the new item is inserted in view after the last item, at the end.

PR Checklist

Please check if your PR fulfills the following requirements:

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Header has been added to all new source files (run build/UpdateHeaders.bat)
• Contains NO breaking changes

Other information

[ghost]

Thanks texaclou for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌

[michael-hawker]

Related/Conflicting with #4349 #4347.

We need to finish validating #4347 and add other tests here before we add a solution.