infra: add exclusion for non-compilable files (related to checkstyle#…

…11685)

checkstyle-tester/projects-to-test-on.properties

@@ -14,7 +14,7 @@ guava|git|https://github.com/google/guava|v28.2||
 
 #spotbugs|git|https://github.com/spotbugs/spotbugs|3.1.2||
 #pmd|git|https://github.com/pmd/pmd|pmd_releases/6.21.0|**/pmd/pmd-java/src/test/**/*,**/pmd/cpd/files/*
-#spoon|git|https://github.com/INRIA/spoon.git|spoon-core-10.1.1|
+#spoon|git|https://github.com/INRIA/spoon.git|spoon-core-10.1.1|**/src/test/resources/**/*
 #lombok-ast|git|https://github.com/rzwitserloot/lombok.ast|v0.2|**/lombok-ast/test/**/*
 
 #spring-framework|git|https://github.com/spring-projects/spring-framework|v4.1.6.RELEASE||