GHA: set ProductArchitecture when packaging the MSIs

Adjust the `msbuild` invocation to include the `ProductArchitecture` property to ensure that we build the MSIs for the proper host. This should help repair the Windows ARM64 toolchain builds.

Author: Steelskin

.github/workflows/swift-toolchain.yml

@@ -3815,6 +3815,7 @@ jobs:
               -p:ImageRoot=${{ github.workspace }}/BuildRoot/Library/Developer `
               -p:WORKAROUND_MIMALLOC_ISSUE_997=$WORKAROUND_MIMALLOC_ISSUE_997 `
               -p:ProductVersion=${{ inputs.swift_version }} `
+              -p:ProductArchitecture=${{ matrix.arch }} `
               ${{ github.workspace }}/SourceCache/swift-installer-scripts/platforms/Windows/bld/bld.wixproj
 
       - name: Package CLI Tools
@@ -3827,6 +3828,7 @@ jobs:
               -p:PASSPHRASE=${{ secrets.PASSPHRASE }} `
               -p:ImageRoot=${{ github.workspace }}/BuildRoot/Library/Developer `
               -p:ProductVersion=${{ inputs.swift_version }} `
+              -p:ProductArchitecture=${{ matrix.arch }} `
               ${{ github.workspace }}/SourceCache/swift-installer-scripts/platforms/Windows/cli/cli.wixproj
 
       - name: Package Debugging Tools
@@ -3839,6 +3841,7 @@ jobs:
               -p:PASSPHRASE=${{ secrets.PASSPHRASE }} `
               -p:ImageRoot=${{ github.workspace }}/BuildRoot/Library/Developer `
               -p:ProductVersion=${{ inputs.swift_version }} `
+              -p:ProductArchitecture=${{ matrix.arch }} `
               ${{ github.workspace }}/SourceCache/swift-installer-scripts/platforms/Windows/dbg/dbg.wixproj
 
       - name: Package IDE Tools
@@ -3851,6 +3854,7 @@ jobs:
               -p:PASSPHRASE=${{ secrets.PASSPHRASE }} `
               -p:ImageRoot=${{ github.workspace }}/BuildRoot/Library/Developer `
               -p:ProductVersion=${{ inputs.swift_version }} `
+              -p:ProductArchitecture=${{ matrix.arch }} `
               ${{ github.workspace }}/SourceCache/swift-installer-scripts/platforms/Windows/ide/ide.wixproj
 
       - name: Package Runtime
@@ -3874,26 +3878,26 @@ jobs:
         with:
           name: Windows-${{ matrix.arch }}-bld-msi
           path: |
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/bld.msi
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/bld.cab
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/bld.msi
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/bld.cab
       - uses: actions/upload-artifact@v4
         with:
           name: Windows-${{ matrix.arch }}-cli-msi
           path: |
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/cli.msi
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/cli.cab
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/cli.msi
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/cli.cab
       - uses: actions/upload-artifact@v4
         with:
           name: Windows-${{ matrix.arch }}-dbg-msi
           path: |
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/dbg.msi
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/dbg.cab
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/dbg.msi
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/dbg.cab
       - uses: actions/upload-artifact@v4
         with:
           name: Windows-${{ matrix.arch }}-ide-msi
           path: |
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/ide.msi
-            ${{ github.workspace }}/BinaryCache/installer/Release/${{ inputs.build_arch }}/ide.cab
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/ide.msi
+            ${{ github.workspace }}/BinaryCache/installer/Release/${{ matrix.arch }}/ide.cab
 
       - uses: actions/upload-artifact@v4
         with:
@@ -4046,6 +4050,7 @@ jobs:
               -p:PASSPHRASE=${{ secrets.PASSPHRASE }} `
               -p:ImageRoot=${{ github.workspace }}/BuildRoot/Library/Developer `
               -p:ProductVersion=${{ inputs.swift_version }} `
+              -p:ProductArchitecture=${{ inputs.build_arch }} `
               -p:WindowsArchitectures="`"aarch64;i686;x86_64`"" `
               -p:WindowsRuntimeARM64="${{ github.workspace }}/BuildRoot/Library/Developer/Runtimes/Windows-aarch64" `
               -p:WindowsRuntimeX64="${{ github.workspace }}/BuildRoot/Library/Developer/Runtimes/Windows-x86_64" `
@@ -4234,6 +4239,7 @@ jobs:
               -p:PASSPHRASE=${{ secrets.PASSPHRASE }} `
               -p:ImageRoot=${{ github.workspace }}/BuildRoot/Library/Developer `
               -p:ProductVersion=${{ inputs.swift_version }} `
+              -p:ProductArchitecture=${{ inputs.build_arch }} `
               -p:AndroidArchitectures="`"x86_64;aarch64;i686;armv7`"" `
               ${{ github.workspace }}/SourceCache/swift-installer-scripts/platforms/Windows/platforms/android/android.wixproj