Replaces testClassesDir with testClassesDirs in ccr build
Replaces testClassesDir with testClassesDirs in ccr build

Relates #30389

strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra