Re-add test case for verifying no file path access for legacy apps.

As part of adapting ExternalStorageHostTest to R scoped storage
restrictions, we removed test case which tested no access
to primary external storage directory and other children directories for
apps with no storage permission. For apps targeting R, with no storage
permission will have write access to external storage directories.
This test app was later modified to target 29. Hence, adding the test
case back.

Test: atest ExternalStorageHostTest#testExternalStorageNone29
Bug: 148918640
Change-Id: I60283d2e9e68188241b7f5254952bf9b86540115
1 file changed