sam-upload-v2 don't update entire table ngOnChanges

`sam-upload-v2` component in `ngOnChanges` is recreating the entire table whenever there is any change to the `uploadedFiles` input (https://github.com/GSA/sam-ui-elements/blob/master/src/ui-kit/form-controls/upload-v2/upload-v2.component.ts#L253).

When this happens, it causes a very noticeable visual refresh of the toggle switches. If a toggle switch is on, after `ngOnChanges` it will be replaced with a new switch that defaults to off, which will then animate itself turning on again.

To prevent this, could we go one level more granular in `ngOnChanges` and test whether there were any changes to each file control in the table, and only remake those that changed or were added?