Revert "Enable metalava sandbox in StubLibraries.bp and ApiDocs.bp."

Reason for revert: breaking several builds downstream
Reverted Changes:
Ia5767debc:Enable metalava sandbox in StubLibraries.bp and Ap...
I7256d29f1:Add sandbox property to the javadoc rule.
Ia69440800:Only report a violation when the file exists.

Change-Id: I5651212314fd39b7ba404936dee416f566c682c9

ApiDocs.bp

@@ -91,7 +91,6 @@ droidstubs {
     arg_files: [
         "core/res/AndroidManifest.xml",
     ],
-    sandbox: true,
     args: metalava_framework_docs_args,
     write_sdk_values: true,
 }

StubLibraries.bp

@@ -60,7 +60,6 @@ stubs_defaults {
     ],
     api_levels_annotations_enabled: false,
     filter_packages: packages_to_document,
-    sandbox: true,
 }
 
 stubs_defaults {
@@ -378,7 +377,6 @@ droidstubs {
         "core/java/android/os/RemoteException.java",
         "core/java/android/util/AndroidException.java",
     ],
-    sandbox: true,
     installable: false,
     sdk_version: "core_platform",
     annotations_enabled: true,