Move windows release (#315)

* Revert "Add support for syncing Windows binaries"

This reverts commit a2a5be6.

* Remove Windows jobs to their own release

With the Windows and Linux jobs intermixed, we would no longer be
able to distribute precompiled releases. Even with two precompiled
releases (one for Linux and one for Windows), we'd be unable to
differentiate which release the instance group pulls from.

config/blobs.yml

@@ -14,10 +14,6 @@ cni/cni-plugins-amd64-v0.7.1.tgz:
   size: 17108856
   object_id: 50dc58eb-107d-483a-4e37-5a243ffed520
   sha: fb29e20401d3e9598a1d8e8d7992970a36de5e05
-cni/cni-plugins-windows-amd64-c74e0e996.tgz:
-  size: 9678154
-  object_id: ed601155-ac1f-4682-684d-76cd6eaa1a95
-  sha: 02c4d67a17a28c26cc471e56bf01dcacd104b346
 cni/util-linux_2.27.1-6ubuntu3_amd64.deb:
   size: 847730
   object_id: 27eb3ec3-220f-4a25-6c4f-ec219c37ac8d
@@ -58,10 +54,6 @@ flannel-v0.11.0-linux-amd64.tar.gz:
   size: 9565743
   object_id: 83064ebe-b45d-4d41-694a-b1e61a781250
   sha: 3024034b2202d5940acf5353037161ea1770a9c5
-flannel-v0.11.0-windows-amd64.tar.gz:
-  size: 9488010
-  object_id: f1a21fd3-b6c3-4f70-48c4-017e55a061c3
-  sha: 71cb61a487c40df8eeb4d2bd68d7e891b51b44bb
 ipset/ipset_6.20.1-1_amd64.deb:
   size: 34156
   object_id: 5dfcce8f-366e-49f0-59e6-9e2d48178750
@@ -98,18 +90,6 @@ kubernetes-1.13.4/kubelet:
   size: 113031192
   object_id: 0d7db619-15e6-4f17-6469-88058024a62b
   sha: 6c43640cd0f4494b4406296fe35579027176b2f7
-kubernetes-windows-1.13.4/kube-proxy.exe:
-  size: 34466816
-  object_id: 56e1ecb1-47aa-467c-60a4-4c2557c411c8
-  sha: e08e17e6370a2ef53c3d6a74cc89ea28d083b55d
-kubernetes-windows-1.13.4/kubectl.exe:
-  size: 39670272
-  object_id: 367d644b-470f-425d-6a24-bb8faa905bd3
-  sha: fa5c7a0d3c7ae7edb8d6fb276dcfcf9a232b17ec
-kubernetes-windows-1.13.4/kubelet.exe:
-  size: 102774272
-  object_id: 458f8def-b633-4ead-48b4-8e7720cc609e
-  sha: 30c8cab80e5940503f9cdd36b51c56f47f0411d2
 libmnl0_1.0.3-3.deb:
   size: 11416
   object_id: 245e085f-1ad2-447d-67bb-1894b960c571