Update licenses codeowners (#11663)

Currently, license directories are owned by both libs (`/distribution/` entry) and engine (`/tools/` entry) teams, and require review from both teams even though there are no related changes in the PR.

License changes are caused by changed dependencies in either libs or the engine. By making the license directories unowned, only the necessary reviewers will be added to the PR

.github/CODEOWNERS

@@ -59,5 +59,9 @@ tsconfig.json
 /test/ @jdunkerley @radeusgd @GregoryTravis @AdRiley @marthasharkey
 /tools/http-test-helper/ @radeusgd @jdunkerley @GregoryTravis @AdRiley @marthasharkey
 
+# Licenses
+/distribution/engine/
+/tools/legal-review/
+
 # The default project template is owned by the libraries team
 /lib/scala/pkg/src/main/resources/default/src/ @radeusgd @jdunkerley @GregoryTravis @AdRiley @marthasharkey