test: Use Set/UnsetGlobals in BasicTestingSetup

...instead of calling initialization functions directly and having to
keep around a ECCVerifyHandle member variable.

This makes the initialization codepath of our tests more closely
resemble those of AppInitMain and potentially eases the review of
subsequent commit removing init::{Set,Unset}Globals.

[META] In a future commit, we will introduce a kernel::Context which
       calls init::{Set,Unset}Globals in its ctor and dtor. It will be
       owned by node::NodeContext, so in the end, this patchset won't
       have made the previously local ECCVerifyHandle global.

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