build: only lint for WIRE_JSON level breaking protobuf changes

This updates our protobuf breaking changes detection to be aligned
(but a bit more strict to catch breaking changes to JSON encoding)
with what is done in core crossplane.

See crossplane/crossplane@ed343d1
for more details.

Signed-off-by: Jared Watts <[email protected]>

Author: jbw976

apis/buf.yaml

@@ -2,7 +2,7 @@ version: v1
 name: buf.build/crossplane/crossplane-runtime
 breaking:
   use:
-    - FILE
+    - WIRE_JSON
 lint:
   use:
     - DEFAULT