Remove unused tools.java11_for_tests and tools.java_for_code_coverage

Summary: These were only used in `buck1` and are no longer needed.

Reviewed By: navidqar

Differential Revision: D67337916

fbshipit-source-id: 2d8e855c60df6dd74fdab917c167cc2fac62e9c1

Author: Ian Childs

.buckconfig

@@ -14,8 +14,5 @@
   target = android-33
   build_tools_version = 33.0.2
 
-[tools]
-  java11_for_tests = "/usr/local/java-runtime/impl/11/bin/java"
-
 [cxx]
   link_path_normalization_args_enabled = true