Add an Insert mode to the dashboard2 ui-table node.

### Description

Currently, the ui-table node offers "Append" and "Replace" as the "Action" value.

It would be handy to have an "Insert" option to insert new data at the top of the table.

This is useful for time based or history data where you want the latest/newest entry to be on top of the table.

### Which customers would this be available to

None

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

Start by locating the dashboard2 ui-table node and comparing how its existing Append and Replace actions are handled. Done means the Action options include Insert and new data appears at the top of the table; check the existing UI-table tests or validation if available.

Written by the indexing model from the issue text.