Replace sinon with nise

[HarelM]

Motivation

It seems that we are using sinon mainly for the fake http server.
nise is this part of sinon exactly and their typings is a bit better than sinon's.
I would advise to add nise to the jest test migration effort and remove sinon once we are done with the migration.

[astridx]

What do you mean exactly? Would you like to change now or should we add it to list #458 ?

[HarelM]

We can do it whenever we want - either when we finish migrating all the tests and then do a sweep to change it, or change it now and make sure that every test that we convert uses the "new way".
I'm fine with both...
We can add it to #458, but it's not something that we introduced as part of the migration but rather an improvement I think is needed and I found out about it while doing the migration.
It's not that critical, but it might help with the migration if we do it now...

[HarelM]

@birkskyum thanks for pushing this forward!!

[birkskyum]

Sure! I'm still trying to figure out how we can get the remaining integration tests modernized too and leaved test'em etc. behind for good.