MAINT, BENCH: remove reference to nose

[tylerjereddy]

We shouldn't be using nose anywhere in our source/testing infrastructure at this point, so the subset of related references that show up via git grep -E -i "nose" are likely mostly safe to remove.

Notably, the installation of the dependency in asv.conf.json is likely wasteful, and reference to nose output in test_streamio.py could likely be updated.