ci: Update WiX files and Windows workflow to reflect ServoShell name (#43104)

`candle` generates the object file based on the name of WiX source file,
which is used by linker later.
This PR effectively changes:
- `Servo.exe` to `ServoShell.exe` for the windows installer
- `Servo.zip` to `ServoShell.zip`

We already generates `servoshell.exe` from build, it is weird that we
keep the name `Servo.exe` for the MSI.

Testing: The problem is fixed, for both executable and zip, see
[this](https://github.com/servo/servo/actions/runs/22841763218/job/66249263625).
Bencher [works
too](https://github.com/servo/servo/actions/runs/22843667165/job/66256020144).
Fixes: #43102, where the windows artifact keeps missing.

---------

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

.github/workflows/windows.yml

@@ -197,21 +197,21 @@ jobs:
         run: .\mach package --profile ${{ inputs.profile }}
       # These files are available
       # MSI Installer: C:\a\servo\servo\target\${{ inputs.profile }}\msi\Installer.msi
-      # Bundle: C:\a\servo\servo\target\${{ inputs.profile }}\msi\servoshell.exe
-      # Zip: C:\a\servo\servo\target\${{ inputs.profile }}\msi\Servo.zip
+      # Bundle: C:\a\servo\servo\target\${{ inputs.profile }}\msi\ServoShell.exe
+      # Zip: C:\a\servo\servo\target\${{ inputs.profile }}\msi\ServoShell.zip
       - name: Upload artifact for mach package
         uses: actions/upload-artifact@v6
         id: upload-exe
         with:
           name: ${{ inputs.profile }}-binary-windows
-          path: C:\\a\\servo\\servo\\target\\${{ inputs.profile }}\\msi\\servoshell.exe
+          path: C:\\a\\servo\\servo\\target\\${{ inputs.profile }}\\msi\\ServoShell.exe
       - name: Upload artifact for mach package (zip)
         uses: actions/upload-artifact@v6
         id: upload-zip
         if: ${{ inputs.upload_zip }}
         with:
           name: ${{ inputs.profile }}-binary-windows-zip
-          path: C:\\a\\servo\\servo\\target\\${{ inputs.profile }}\\msi\\Servo.zip
+          path: C:\\a\\servo\\servo\\target\\${{ inputs.profile }}\\msi\\ServoShell.zip
       - name: Collect artifact IDs needed by the release workflow
         id: artifact_ids
         shell: bash
@@ -230,7 +230,7 @@ jobs:
       target: 'windows'
       profile: ${{ inputs.profile }}
       compressed-file-path: ''
-      binary-path: ${{ inputs.profile }}-binary-windows/servoshell.exe
+      binary-path: ${{ inputs.profile }}-binary-windows/ServoShell.exe
       file-size: true
       speedometer: false
       dromaeo: false