test(acl): add UsePreviouslyBuiltVHD for AB update test

[bfjelds]

Add UsePreviouslyBuiltVHD flag to scenario Config that resolves the VHD to the most recent prior main-branch build in the build gallery, excluding the current pipeline run. This avoids the UUID collision where the current build's VHD and COSI share filesystem UUIDs.

New PreviouslyBuiltSIGVersion function on AzureClient:

• Lists all versions in the build gallery for the image definition
• Filters to branch=refs/heads/main, provisioning Succeeded/Updating
• Excludes current build by matching Config.BuildID against buildId tag
• Sorts by parsed 'now' tag (unix epoch) for deterministic ordering
• Supports PREVIOUSLY_BUILT_VHD_BUILD_ID env var override for debugging

Test_ACL_ABUpdate now sets UsePreviouslyBuiltVHD: true to boot from a prior build before applying the current pipeline's COSI.

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[github-actions]

Changes cached containers or packages on windows VHDs

Please get a Windows SIG member to approve.

The following dif file shows any additions or deletions from what will be cached on windows VHDs organised by VHD type.

• Additions are new things cached.
• Deletions are things no longer cached.

diff --git a/vhd_files/2022-containerd-gen2.txt b/vhd_files/2022-containerd-gen2.txt
index dddb312..ce25fa5 100644
--- a/vhd_files/2022-containerd-gen2.txt
+++ b/vhd_files/2022-containerd-gen2.txt
@@ -115 +114,0 @@ mcr.microsoft.com/oss/v2/azure/secrets-store/provider-azure:v1.7.2
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.33.10-windows-hp
@@ -118,2 +116,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.3-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.4-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.33.10-windows-hp
@@ -122 +118,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.5-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.6-windows-hp
@@ -124 +119,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.2-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.3-windows-hp
diff --git a/vhd_files/2022-containerd.txt b/vhd_files/2022-containerd.txt
index df70a07..620eb5a 100644
--- a/vhd_files/2022-containerd.txt
+++ b/vhd_files/2022-containerd.txt
@@ -115 +114,0 @@ mcr.microsoft.com/oss/v2/azure/secrets-store/provider-azure:v1.7.2
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.33.10-windows-hp
@@ -118,2 +116,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.3-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.4-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.33.10-windows-hp
@@ -122 +118,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.5-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.6-windows-hp
@@ -124 +119,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.2-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.3-windows-hp
diff --git a/vhd_files/2025-gen2.txt b/vhd_files/2025-gen2.txt
index 81e5913..d5aea5a 100644
--- a/vhd_files/2025-gen2.txt
+++ b/vhd_files/2025-gen2.txt
@@ -15 +15 @@ c:\akse-cache\csi-proxy\: https://packages.aks.azure.com/csi-proxy/v1.1.2-hotfix
-c:\akse-cache\wcn\: mcr.microsoft.com/wcn/package:1.7.1-cpu-arch
+c:\akse-cache\wcn\: mcr.microsoft.com/wcn/package:1.6.0-cpu-arch
@@ -45 +44,0 @@ mcr.microsoft.com/oss/v2/azure/secrets-store/provider-azure:v1.7.2
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.33.10-windows-hp
@@ -48,2 +46,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.3-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.4-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.33.10-windows-hp
@@ -52 +48,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.5-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.6-windows-hp
@@ -54 +49,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.2-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.3-windows-hp
diff --git a/vhd_files/2025.txt b/vhd_files/2025.txt
index db02527..7012908 100644
--- a/vhd_files/2025.txt
+++ b/vhd_files/2025.txt
@@ -15 +15 @@ c:\akse-cache\csi-proxy\: https://packages.aks.azure.com/csi-proxy/v1.1.2-hotfix
-c:\akse-cache\wcn\: mcr.microsoft.com/wcn/package:1.7.1-cpu-arch
+c:\akse-cache\wcn\: mcr.microsoft.com/wcn/package:1.6.0-cpu-arch
@@ -45 +44,0 @@ mcr.microsoft.com/oss/v2/azure/secrets-store/provider-azure:v1.7.2
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.33.10-windows-hp
@@ -48,2 +46,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.3-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azuredisk-csi:v1.34.4-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.33.10-windows-hp
@@ -52 +48,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.5-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.34.6-windows-hp
@@ -54 +49,0 @@ mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.2-windows-hp
-mcr.microsoft.com/oss/v2/kubernetes-csi/azurefile-csi:v1.35.3-windows-hp