[workloads] Work around main still targeting net7.0 (#76036)

* Work around main still targeting net7.0

eng/Versions.props

@@ -8,7 +8,7 @@
     <PatchVersion>0</PatchVersion>
     <SdkBandVersion>8.0.100</SdkBandVersion>
     <PackageVersionNet6>6.0.10</PackageVersionNet6>
-    <PackageVersionNet7>7.0.0-rc.2.22458.4</PackageVersionNet7>
+    <!-- problematic until NetCoreAppCurrent is net8.0 <PackageVersionNet7>7.0.0</PackageVersionNet7> -->
     <PreReleaseVersionLabel>alpha</PreReleaseVersionLabel>
     <PreReleaseVersionIteration>1</PreReleaseVersionIteration>
     <!-- Set assembly version to align with major and minor version,

src/mono/nuget/Microsoft.NET.Workload.Mono.Toolchain.Manifest/Microsoft.NET.Workload.Mono.Toolchain.Manifest.pkgproj

@@ -38,7 +38,8 @@
       <_WorkloadManifestValues Include="WorkloadVersion" Value="$(PackageVersion)" />
       <_WorkloadManifestValues Include="PackageVersion" Value="$(PackageVersion)" />
       <_WorkloadManifestValues Include="PackageVersionNet6" Value="$(PackageVersionNet6)" />
-      <_WorkloadManifestValues Include="PackageVersionNet7" Value="$(PackageVersionNet7)" />
+      <_WorkloadManifestValues Include="PackageVersionNet7" Value="$(PackageVersionNet7)" Condition="'$(PackageVersionNet7)' != ''" />
+      <_WorkloadManifestValues Include="PackageVersionNet7" Value="$(PackageVersion)" Condition="'$(PackageVersionNet7)' == ''" />
       <_WorkloadManifestValues Include="NetCoreAppCurrent" Value="$(NetCoreAppCurrent)" />
       <_WorkloadManifestValues Include="EmscriptenVersion" Value="$(MicrosoftNETRuntimeEmscriptenVersion)" />
     </ItemGroup>

src/mono/nuget/Microsoft.NET.Workload.Mono.Toolchain.Manifest/WorkloadManifest.targets.in

@@ -7,8 +7,10 @@
       <TargetsNet8    Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp' and $([MSBuild]::VersionEquals('$(TargetFrameworkVersion)', '8.0'))">true</TargetsNet8>
       <TargetsNet6    Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp' and $([MSBuild]::VersionEquals('$(TargetFrameworkVersion)', '6.0'))">true</TargetsNet6>
       <TargetsNet7    Condition="'$(TargetFrameworkIdentifier)' == '.NETCoreApp' and $([MSBuild]::VersionEquals('$(TargetFrameworkVersion)', '7.0'))">true</TargetsNet7>
-
       <TargetsCurrent Condition="'$(TargetsNet8)' == 'true'">true</TargetsCurrent>
+
+      <!-- override WorkloadDetectionWhen net7 == net8 -->
+      <WasmNativeWorkload7 Condition="'${PackageVersionNet7}' == '${PackageVersion}'">$(WasmNativeWorkload8)</WasmNativeWorkload7>
     </PropertyGroup>
 
     <PropertyGroup Condition="'$(RuntimeIdentifier)' == 'browser-wasm' and '$(TargetFrameworkIdentifier)' == '.NETCoreApp'">

src/mono/nuget/Microsoft.NET.Workload.Mono.Toolchain.net7.Manifest/Microsoft.NET.Workload.Mono.Toolchain.net7.Manifest.pkgproj

@@ -36,7 +36,8 @@
 
     <ItemGroup>
       <_WorkloadManifestValues Include="WorkloadVersion" Value="$(PackageVersion)" />
-      <_WorkloadManifestValues Include="PackageVersionNet7" Value="$(PackageVersionNet7)" />
+      <_WorkloadManifestValues Include="PackageVersionNet7" Value="$(PackageVersionNet7)" Condition="'$(PackageVersionNet7)' != ''" />
+      <_WorkloadManifestValues Include="PackageVersionNet7" Value="$(PackageVersion)" Condition="'$(PackageVersionNet7)' == ''" />
       <_WorkloadManifestValues Include="EmscriptenVersion" Value="$(MicrosoftNETRuntimeEmscriptenVersion)" />
       <_WorkloadManifestValues Include="NetCoreAppCurrent" Value="$(NetCoreAppCurrent)" />
     </ItemGroup>

src/mono/wasm/Wasm.Build.Tests/Wasm.Build.Tests.csproj

@@ -77,7 +77,8 @@
 
     <ItemGroup>
       <_RuntimePackVersions Include="$(PackageVersion)" EnvVarName="RUNTIME_PACK_VER8" />
-      <_RuntimePackVersions Include="$(PackageVersionNet7)" EnvVarName="RUNTIME_PACK_VER7" />
+      <_RuntimePackVersions Include="$(PackageVersionNet7)" EnvVarName="RUNTIME_PACK_VER7" Condition="'$(PackageVersionNet7)' != ''"/>
+      <_RuntimePackVersions Include="$(PackageVersion)" EnvVarName="RUNTIME_PACK_VER7" Condition="'$(PackageVersionNet7)' == ''"/>
       <_RuntimePackVersions Include="$(PackageVersionNet6)" EnvVarName="RUNTIME_PACK_VER6" />
 
       <RunScriptCommands Condition="'$(OS)' != 'Windows_NT'" Include="export %(_RuntimePackVersions.EnvVarName)=&quot;%(_RuntimePackVersions.Identity)&quot;" />