Fix reference to java_infos in compile.bzl (#915)

* Fix reference to java_infos in compile.bzl

`compile.bzl` was incorrectly referencing `java_info` instead of `java_infos` in cases where annotation processors were found, causing compilation to fail with an opaque error (#877). This fixes the reference.

* Replace incorrect property access on list with list comprehension

Fixing the typo resulted in the following error:

```
Traceback (most recent call last):
	File "/workdir/kotlin/internal/jvm/impl.bzl", line 219, column 36, in kt_jvm_library_impl
		_kt_jvm_produce_jar_actions(ctx, "kt_jvm_library") if ctx.attr.srcs or ctx.attr.resources else export_only_providers(
	File "/workdir/kotlin/internal/jvm/compile.bzl", line 493, column 50, in kt_jvm_produce_jar_actions
		outputs_struct = _run_kt_java_builder_actions(
	File "/workdir/kotlin/internal/jvm/compile.bzl", line 751, column 66, in _run_kt_java_builder_actions
		ap_class_jar = [jars.class_jar for jars in java_infos.outputs.jars][0],
Error: 'list' value has no field or method 'outputs'
```

`java_infos` is a list and thus doesn't have an `outputs` field, but each `java_info` inside the list does. Thus replacing `java_infos.outputs.jars` with the list comprehension `[java_info.outputs.jars for java_info in java_infos]` gets us a list of `jars` objects that can be used in the outer list comprehension.

* extract out inner list comprehension

* flatten list of jars lists

Author: avarun42

kotlin/internal/jvm/compile.bzl

@@ -746,9 +746,10 @@ def _run_kt_java_builder_actions(
 
     annotation_processing = None
     if annotation_processors:
+        outputs_list = [java_info.outputs for java_info in java_infos]
         annotation_processing = _create_annotation_processing(
             annotation_processors = annotation_processors,
-            ap_class_jar = [jars.class_jar for jars in java_info.outputs.jars][0],
+            ap_class_jar = [jars.class_jar for outputs in outputs_list for jars in outputs.jars][0],
             ap_source_jar = ap_generated_src_jar,
         )