immediately stop on second interrupt

[w-e-w]

Description

an addition to
Don't Interrupt in the middle (when using Interrupt button, if generating more than one image, stop after the generation of an image has finished, instead of immediately)

• if the user presses the interrupt request twice, it will interrupt it immediately

• also add a message telling the user that the button has indeed been pressed
  otherwise one might be confused on why the interrupt hasn't been processed and keep spamming the button like I did

note: the message might need some rephrasing

note: the usere could also clicke Interrupt and then Skip to to achieve a similar effect of immediately stoping, but I think double clicking is more intuitive

Screenshots/videos:

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests