Enable clippy by default for tests

After this change it is a hard error to commit anything that doesn't
conform to Clippy's default warning set.

.bazelrc

@@ -28,21 +28,10 @@ build:self_execute --remote_default_exec_properties=cpu_count=1
 build:self_execute --platform_suffix=self-execute
 
 build --aspects=@rules_rust//rust:defs.bzl%rustfmt_aspect
+build --aspects=@rules_rust//rust:defs.bzl%rust_clippy_aspect
+
 test --@rules_rust//:rustfmt.toml=//:.rustfmt.toml
-# This will make rustfmt only run on `bazel test`.
-test --output_groups=+rustfmt_checks
 
-# TODO: The repo doesn't build with clippy enabled yet and this aspect will fail
-#       even on warnings. To test a single build target:
-#
-#           bazel build --config=clippy mytarget
-#
-#       To test current conformance of the entire repository, run tests with:
-#
-#           bazel test --config=clippy --keep_going ...
-#
-#       When all warnings are fixed the config gate will be removed and clippy
-#       will be enabled by default during tests.
-build:clippy --aspects=@rules_rust//rust:defs.bzl%rust_clippy_aspect
-build:clippy --output_groups=+clippy_checks
-test:clippy --output_groups=+clippy_checks
+# This will make rustfmt and clippy only run on `bazel test`.
+test --output_groups=+rustfmt_checks
+test --output_groups=+clippy_checks