search: assert required implementations for jobs

Created by: rvantonder

As long as we can keep the list of jobs up to date, we'll trigger something like:

--- FAIL: TestMembership (0.00s)
types_test.go:8: Please add a case statement for your job (unsupported job *job.selectJob for SexpFormat printer)

if an implementation is missing

Test plan

I deleted a case and ran the test and it fails as expected.