Switch to the new glob system of ignore in metro flowconfig

Summary:
Migrate to the new system that's less error prone.

Changelog: [Internal]

___

Differential Revision: D114150436

fbshipit-source-id: 1adce9ef4398a279c53c7ca2b3b8e99a11368ed2

Author: SamChou19815

.flowconfig

@@ -1,9 +1,11 @@
 [ignore]
-<PROJECT_ROOT>/packages/.*/build/.*
-<PROJECT_ROOT>/\.\(hg\|sl\|git\)/.*
+glob:packages/*/build/**
+glob:.hg/**
+glob:.sl/**
+glob:.git/**
 # this transient dep bundles tests with their package, which flow attempts to parse
 # and crashes out as the test includes purposely malformed json
-<PROJECT_ROOT>\(/.*\)?/node_modules/resolve/test/.*
+glob:**/node_modules/resolve/test/**
 
 [options]
 emoji=true