Add timezone change for windows runner

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

integtest.sh

@@ -136,6 +136,10 @@ if [ "$DISABLE_VIDEO" = "true" ]; then
     mv -v cypress_new.json cypress.json
 fi
 
+if [ "$OSTYPE" = "msys" ] || [ "$OSTYPE" = "cygwin" ] || [ "$OSTYPE" = "win32" ]; then
+    powershell -Command "Set-TimeZone -Id 'Pacific Standard Time' -PassThru"
+fi
+
 if [ "$SECURITY_ENABLED" = "true" ]
 then
    echo "run security enabled tests"