Add a vm.isSimulation() cheatcode

[Skelectric]

Component

Forge

Describe the feature you would like

I would like for my scripts to skip certain operations in the pre-broadcast simulations.

if (vm.isSimulation() == false) {
    stdJson.write(json, filepath);   
}

Without the ability to differentiate whether the script is executing in a simulation at runtime, I can't perform certain operations that require persistent storage because the simulation gets in the way.

Additional context

No response

[mattsse]

this is useful to have imo.

supportive of this.

I think we can add this via bool field that is set before and unset after simulation.

[mds1]

One note is we don't have any script-only cheats yet, so what should this return during tests? Perhaps a better way to implement is as part of #2900, and make the "Script" context more granular

[mattsse]

right, forgot about this. #2900 is the right way to do this

[0x0elliot]

so, would you rather even have this implemented? @mattsse

[zerosnacks]

Marking as completed by #7377