test: enable Promise.finally tests

Refs: chakra-core/ChakraCore#4668
Fixes: #464
PR-URL: #568
Reviewed-By: Jimmy Thomson <jithomso@microsoft.com>

Author: kfarnung

test/parallel/parallel.status

@@ -177,15 +177,6 @@ test-process-hrtime-bigint : SKIP
 # One of the benchmarks uses object spread syntax, which chakra does not support
 test-benchmark-es : SKIP
 
-# These tests exercises Promise.prototype.finally which isn't currently supported
-# https://github.com/Microsoft/ChakraCore/pull/4668
-test-fs-append-file : SKIP
-test-fs-promises-readfile : SKIP
-test-fs-promises-writefile : SKIP
-test-fs-promises : SKIP
-test-fs-promises-file-handle-truncate : SKIP
-test-fs-promises-readfile-empty : SKIP
-
 # This test expects stack overflow to behave in a specific way, which doesn't happen with chakracore
 test-fs-readdir-stack-overflow : SKIP