Add Windows PV tools installer tests

[dinhngtu]

This PR adds tests for the new XCP-ng 9.x Windows PV Tools installer.
It tests various actions of the installer (install, uninstall, upgrade) under various conditions (with XCP-ng v8 tools, with Citrix tools, with Windows Update drivers, etc.)
It adds a dependency on 2 new ISO images, the structures of which are documented below:

guest-tools-win.iso
├───package
│   └───XenClean
│       └───x64
│           └───bin
└───testsign

other-guest-tools-win.iso
├───citrix-9.4.0
│   ├───XenBus
│   │   ├───x64
│   │   └───x86
│   ├───XenIface
│   │   ├───x64
│   │   └───x86
│   ├───XenNet
│   │   ├───x64
│   │   └───x86
│   ├───XenVbd
│   │   ├───x64
│   │   └───x86
│   └───XenVif
│       ├───x64
│       └───x86
├───xcp-ng-8.2.2.200
│   ├───xenbus
│   │   ├───x64
│   │   └───x86
│   ├───xeniface
│   │   ├───x64
│   │   └───x86
│   ├───xennet
│   │   ├───x64
│   │   └───x86
│   ├───xenvbd
│   │   ├───x64
│   │   └───x86
│   └───xenvif
│       ├───x64
│       └───x86
└───xcp-ng-9.0.9000
    ├───package
    │   └───XenClean
    │       └───x64
    │           └───bin
    └───testsign

I have run these tests on Windows Server 2016, 2019, 2022 and 2025. I used customized images with testsigning enabled.

[stormi]

This will be a nice addition to the tests. Here are my review comments.

[benjamreis]

LGTM! 👍

[dinhngtu]

I'm doing some refactoring to make testing multiple guest tools/other tools versions a bit easier. Currently running final tests.

[dinhngtu]

I've refactored the tests as following:

• The ISO files of our test tools and other tools could be configured in data.py (see WIN_GUEST_TOOLS_ISOS and OTHER_GUEST_TOOLS_ISO).
• Each ISO configuration now has a download parameter that lets the test use an included ISO file or download it from a HTTP location into a local ISO SR.
• Each configuration in WIN_GUEST_TOOLS_ISOS specifies a ISO location, whether it requires testsigning, MSI file name, etc.
• We can configure the contents of our other tools ISO file via OTHER_GUEST_TOOLS using a similar method.
• All guest and other tools versions now share the same parameterized tests.
• I've split guest-tools/win into several separate module files.
• XenClean tests have been added.
• The reinstall_early test has been removed due to changes in newer installers.
• Some tests will only pass with the newest tools version built from source (due to xcp-ng/win-pv-drivers@b70bb37)

[stormi]

Looks good. Just a few minor comments.

I will delay my approval until we have setup the tests in our CI so that they run once merged on master.

[dinhngtu]

I've added some tools and scripts useful for reducing Windows image sizes.

[dinhngtu]

I've switched the ISO download code to use the existing NFS ISO SR config.

[dinhngtu]

Changes since last time:

• Reworked OTHER_GUEST_TOOLS is_msi property into a nullable enum with values msi/inf/None. Separate the "vendor/Windows Update" case and the "Citrix inf" case since these are actually 2 different cases.
• Added several hacks to work around edge cases that caused test failures (e.g. CD insertion hang, CD drive not detected).
• Added the commit "lib/host: Allow specifying default SR UUID" to ease running tests on specific hardware (e.g. particular storage types).
• Added scripts/guests/windows/install-drivers.ps1.
• Refactor Windows shutdown command into a constant.

Upgrades are marked as xfail since they require multiple reboots, which I haven't yet taken into account.

[gduperrey]

CI:

• 8.2: ✅
• 8.3: ✅

[stormi]

Thanks for a good PR!