clj-kondo hook for the single test version of defexpect

[seancorfield]

The single test version of defexpect with an expected string can throw spurious errors, tho I think this is a clj-kondo issue and not an expectations issue.

(defexpect missing-body-in-when-test
  "Missing body in when"
  (:message (check-str "(when true)")))

"Missing body in when" is labeled as a "missing docstring" currently, due to the :lint-as rule tying defexpect to deftest.

Originally posted by @NoahTheDuke in #29 (comment)

[seancorfield]

After thinking about this on and off for about six months, I think I'm just going to deprecate the implicit-expect version of defexpect. It was originally a migration aid, but it just adds complexity and maintenance overhead and weird edge cases.

Consequently, I'm not going to fix this -- I'm going to close it -- and I'll open two deprecation/rejection issues to make this go away. /cc @NoahTheDuke