Add profile black to isort config

I was seeing some odd behavior where running pre-commit, adding the modified
files, and then running pre-commit again would result making more modifications
to some of the same files. This felt odd. You shouldn't have to run pre-commit
more multiple times for it to eventually come to a final "solution". I believe
the problem was because we are using the tool `black` to format things, but weren't
registering the black profile with `isort` this lead to some conflicting formatting
rules, and the two tools had to negotiate a few times before being both satisfied.
Registering the profile `black` with `isort` resolved this problem.

.isort.cfg

@@ -1,3 +1,4 @@
 [settings]
+profile=black
 extend_skip_glob=.github/*,third-party-stubs/*,scripts/*
 known_first_party=dbt,dbt_adapters,dbt_common,dbt_extractor,dbt_semantic_interface