fix(DataGrid): tabbing doesnt properly bringing cell into view, when cell expanded in edit-mode

[Xiaoy312]

Fixes unoplatform/uno#14311

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

When moving to the next cell using Tab and this cell's size changing from entering edit-mode, the scroll-into-view is performed based on its previous size from the normal-mode.

What is the new behavior?

The scroll-into-view is performed again, if the cell size grows within a short time frame.

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
• Tested code with current supported SDKs(https://github.com/CommunityToolkit/WindowsCommunityToolkit-design-assets)
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Contains NO breaking changes

Other information

This PR is a cherry-pick of CommunityToolkit#4984.

[jeromelaban]

@Mergifyio backport unorel/winui/7.1.200

[mergify]

backport unorel/winui/7.1.200

✅ Backports have been created

• #215 fix(DataGrid): tabbing doesnt properly bringing cell into view, when cell expanded in edit-mode (backport #214) has been created for branch unorel/winui/7.1.200