Remove GitHub Action Usage of Windows Server 2019 (#5139)

* Initial plan for issue

* Remove Windows Server 2019 from GitHub Actions workflows and test code

Co-authored-by: nibanks <20663557+nibanks@users.noreply.github.com>

* Address code review feedback: remove empty line and revert test code changes

Co-authored-by: nibanks <20663557+nibanks@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: nibanks <20663557+nibanks@users.noreply.github.com>

Author: Copilot

.github/workflows/build-reuse-win.yml

@@ -31,9 +31,8 @@ on:
       os:
         required: false
         type: string
-        default: 'windows-2019'
+        default: 'windows-2022'
         # options:
-        #   - windows-2019
         #   - windows-2022
         #   - windows-2025
       arch:

.github/workflows/build-reuse-winkernel.yml

@@ -29,9 +29,8 @@ on:
       os:
         required: false
         type: string
-        default: 'windows-2019'
+        default: 'windows-2022'
         # options:
-        #   - windows-2019
         #   - windows-2022
       arch:
         required: false

.github/workflows/test.yml

@@ -133,7 +133,6 @@ jobs:
           { config: "Debug", plat: "linux", os: "ubuntu-24.04", arch: "x64", tls: "quictls", systemcrypto: "-UseSystemOpenSSLCrypto", build: "-Test", xdp: "-UseXdp"  },
           { config: "Release", plat: "linux", os: "ubuntu-24.04", arch: "x64", tls: "quictls", systemcrypto: "-UseSystemOpenSSLCrypto", build: "-Test"  },
           { config: "Release", plat: "linux", os: "ubuntu-24.04", arch: "x64", tls: "quictls", systemcrypto: "-UseSystemOpenSSLCrypto", build: "-Test", xdp: "-UseXdp"  },
-          { config: "Debug", plat: "windows", os: "windows-2019", arch: "x64", tls: "quictls", build: "-Test" },
           { config: "Debug", plat: "windows", os: "windows-2022", arch: "x64", tls: "schannel", sanitize: "-Sanitize", build: "-Test" },
           { config: "Debug", plat: "windows", os: "windows-2022", arch: "x64", tls: "schannel", xdp: "-UseXdp", sanitize: "-Sanitize", build: "-Test" },
           { config: "Debug", plat: "windows", os: "windows-2022", arch: "x64", tls: "schannel", xdp: "-UseXdp", qtip: "-UseQtip", sanitize: "-Sanitize", build: "-Test" },