Allow to use shutdown now then closing a `WorkflowRuntime`

[mcruzdev]

Proposal

It would be great if we have a way to close "now" all WorkflowRuntime resources.

It is intended to be used in tests or live reload approaches.

[mcruzdev]

/assign

[javier-aliaga]

@mcruzdev @siri-varma I think this PR #1727 will help to mitigate the problem as the close should be much faster now