disable POKE for fluffy tests by default (#1640)

[mynameisdaniil]

No description provided.

[kdeme]

While this works, I was thinking of rather making it into a runtime option.

This will especially be useful for portal-hive testing (the main reason we need it, although in our own testing we could also have tests that require POKE to be turned on or off).
The reason for this is that portal-hive uses our Fluffy docker image, available on docker hub, and else we need to build a second version for this, which I wouldn't recommend.

So instead I think it could be a runtime option, probably a hidden cli option, which could be added to the portal config, and a new disablePoke field in the PortalProtocol. wdyt?

[mynameisdaniil]

@kdeme pls take a look again. More like this?

[mynameisdaniil]

@kdeme I've addressed the issues you've mentioned. Please take one more look.