Removing iSCSI tests from integration tests

I've tried the test on a clean GCP Windows 2016/2019
VM and this works.
This might be related to the Server Target feature
install on the github workflow environment.
Might be worth fixing with the other disabled
integration tests.

Change-Id: If76902118f1a2887caf5c554d339ad1dc13f04a8

.github/workflows/windows.yml

@@ -31,7 +31,6 @@ jobs:
           Write-Output "getting named pipes"
           [System.IO.Directory]::GetFiles("\\.\\pipe\\")
           $env:CSI_PROXY_GH_ACTIONS="TRUE"
-          $env:ENABLE_ISCSI_TESTS="TRUE"
           go test -v -race ./integrationtests/...
   unit_tests:
     strategy: