feat(snapshots): Implement volume shadow copy support on Windows (#3543)

* Implement volume shadow copy support on Windows

* Update go-vss version

* Fix unused variables

* Rename upload_actions*.go files

* Move vss settings to a separate policy section

* Handle existing shadow copy root

* Fix tests

* Fix lint issues

* Add cli policy test

* Add OS snapshot integration test

* Add GitHub Actions VSS test

* Fix "Incorrect function" error for root VSS snapshots

* Rename err to finalErr in createOSSnapshot

* Add OSSnapshotMode test

* Do not modify paths starting with \\?\ on Windows

* Allow warning messages in logfile tests

* Fix ignorefs not wrapping OS snapshot directory

* Retry VSS creation if another op was in progress

---------

Co-authored-by: Jarek Kowalski <jaak@jkowalski.net>

.github/workflows/volume-shadow-copy-test.yml

@@ -0,0 +1,42 @@
+name: Volume Shadow Copy Test
+on:
+  push:
+    branches: [ master ]
+    tags:
+      - v*
+  pull_request:
+    branches: [ master ]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  vss-test:
+    name: Volume Shadow Copy Test
+    runs-on: windows-latest
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      with:
+        fetch-depth: 0
+    - name: Set up Go
+      uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
+      with:
+        go-version-file: 'go.mod'
+        check-latest: true
+      id: go
+    - name: Install gsudo
+      shell: bash
+      run: |
+        choco install -y --no-progress gsudo
+        echo "C:\tools\gsudo\Current" >> $GITHUB_PATH
+    - name: Admin Test
+      run: gsudo make os-snapshot-tests
+    - name: Non-Admin Test
+      run: gsudo -i Medium make os-snapshot-tests
+    - name: Upload Logs
+      uses: actions/upload-artifact@c7d193f32edcb7bfad88892161225aeda64e9392 # v4.0.0
+      with:
+        name: logs
+        path: .logs/**/*.log
+        if-no-files-found: ignore
+      if: ${{ always() }}