Make coverage collection work for Buck2 + Robolectric

Summary:
Updated Buck macros to generate class name to source mappings for Robolectric tests.

After doing that, coverage was failing because Jacoco was trying to process JARs which didn't exist locally. Fixed by ensuring that mappings are only generated for JARs which are present at runtime -- we shouldn't generate mappings for "provided" or "provided_exported" deps.

Reviewed By: IanChilds

Differential Revision: D44843318

fbshipit-source-id: b8a3fa862c3c9561e19a1d5b5c682ef60a5e2741

android/robolectric_test.bzl

@@ -82,6 +82,7 @@ def robolectric_test_impl(ctx: "context") -> ["provider"]:
         ctx,
         java_providers.java_library_info,
         java_providers.java_packaging_info,
+        java_providers.class_to_src_map,
         extra_cmds = extra_cmds,
         extra_classpath_entries = extra_classpath_entries,
     )