Test: 'Restart Frame'

[weinand]

Test for #9145:

• any OS - @DonJayamanne

VS Code now has a 'Restart Frame' action in the stack frame context menu in the CALL STACK viewlet.
'Restart Frame' is only available for debug extensions that support this functionality, e.g. VS Code's builtin Node Debug.

Verify that:

• it restarts execution of the selected stack frame
• that the VARIABLES and CALL STACK view update correctly
• that the editor shows the current line in the correct color.

Please note: make sure to use a node.js version >= 5.11 since 'Restart Frame' does not work in all situations for older version of node (see #9483)