[IMP] sale_timesheet: control button on plan project

This commit makes the project overview handle action
button in its control panel. When calling server to get
overview HTML code, we also get a list of actions to display
in the control panel. Those are rendered client side.

Since when an action is done, we usually don't want the button
to be display anymore, reloading the overview is required.
The overview is now refreshed when navigating with the breadcrumb,
so each time the overview is displayed, an RPC call to the server
is done (`do_show` method override).

Task #49213