Allow some additional clippy lints that we want to keep in tests

In a coming commit we'll enable `clippy` linting in our test code.
However, there's some things we do in tests (which we might
reasonably do in non-test code in the future) that clippy is
unhappy with, which we explicitly allow here.

Author: TheBlueMatt

ci/check-lint.sh

@@ -6,6 +6,10 @@ RUSTFLAGS='-D warnings' cargo clippy -- \
 	-D clippy::clone_on_ref_ptr \
 	`# Things where clippy is just wrong` \
 	-A clippy::unwrap-or-default \
+	-A clippy::upper_case_acronyms \
+	`# Things where we do odd stuff on purpose ` \
+	-A clippy::unusual_byte_groupings \
+	-A clippy::unit_arg \
 	`# Errors` \
 	-A clippy::erasing_op \
 	-A clippy::never_loop \