fix(igxHGrid): Make sure visibleColumnIndex is not greater than columns l…

[mddragnev]

…ength #5126

Closes #5126

Additional information (check all that apply):

• Bug fix
• New functionality
• Documentation
• Demos
• CI/CD

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code
• This PR includes API docs for newly added methods/properties
• This PR includes feature/README.MD updates for the feature docs
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes ng update migrations for the breaking changes
• This PR includes behavioral changes and the feature specification has been updated with them

[ChronosSF]

The issue still reproduces if navigating up instead of down. Check if you can apply code similar to the one that prevents the bug from occuring when navigating between children of the same level:

private focusNextChild(elem, visibleColumnIndex, grid) {
...
        // Update column index since the next child can have in general less columns than visibleColumnIndex value.
        const lastCellIndex = childGrid.unpinnedColumns[childGrid.unpinnedColumns.length - 1].visibleIndex;
        visibleColumnIndex = Math.min(lastCellIndex, visibleColumnIndex);
...
}