add action copy button

[pigreco]

Feature description

Sometimes it would be very useful to copy an existing action and change just a few details, currently it is necessary to redo every action from scratch.

Additional context

it would be useful like this:
#57396

[Speedrace4]

I'm about to make a PR for this, can I be assigned to it?

[Speedrace4]

@pigreco PR here: #57647; would appreciate if you could look at the changes to see if it provides the functionality that you wanted

[pigreco]

@pigreco PR here: #57647; would appreciate if you could look at the changes to see if it provides the functionality that you wanted

I'm not a developer and can't evaluate whether the code does what I asked for, but I really appreciate what you did.
Thank you