Enable explicit SBOM generation in project files

Updated the `<GenerateSBOM>` property in `coverlet.collector.csproj`, `coverlet.console.csproj`, and `coverlet.msbuild.tasks.csproj` to explicitly set it to `true`, ensuring consistent SBOM generation across all environments. Previously, this property relied on the `$(TF_BUILD)` variable.

Additionally, removed a redundant closing `</Project>` tag from `coverlet.collector.csproj` to improve file structure and readability.

Author: Bertk

src/coverlet.collector/coverlet.collector.csproj

@@ -19,7 +19,7 @@
     <!-- disable transitive version update and use versions defined in coverlet.core -->
     <CentralPackageTransitivePinningEnabled>false</CentralPackageTransitivePinningEnabled>
     <!-- create SBOM for CI build-->
-    <GenerateSBOM>$(TF_BUILD)</GenerateSBOM>
+    <GenerateSBOM>true</GenerateSBOM>
   </PropertyGroup>
 
   <!-- Nuget package properties https://docs.microsoft.com/en-us/nuget/reference/msbuild-targets -->
@@ -75,5 +75,5 @@
       <TfmSpecificPackageFile Include="@(ReferenceCopyLocalPaths)" Exclude="@(_ResolvedProjectReferencePaths)" PackagePath="build\$(TargetFramework)\%(ReferenceCopyLocalPaths.DestinationSubPath)" />
     </ItemGroup>
   </Target>
-  
+
 </Project>

src/coverlet.console/coverlet.console.csproj

@@ -7,7 +7,7 @@
     <PackAsTool>true</PackAsTool>
     <AssemblyTitle>coverlet.console</AssemblyTitle>
     <!-- create SBOM for CI build-->
-    <GenerateSBOM>$(TF_BUILD)</GenerateSBOM>
+    <GenerateSBOM>true</GenerateSBOM>
   </PropertyGroup>
 
   <!-- Nuget package properties https://docs.microsoft.com/en-us/nuget/reference/msbuild-targets -->

src/coverlet.msbuild.tasks/coverlet.msbuild.tasks.csproj

@@ -20,7 +20,7 @@
     <CentralPackageTransitivePinningEnabled>false</CentralPackageTransitivePinningEnabled>
     <NoWarn>$(NoWarn);NU5100;NU5129;NU5127</NoWarn>
     <!-- create SBOM for CI build-->
-    <GenerateSBOM>$(TF_BUILD)</GenerateSBOM>
+    <GenerateSBOM>true</GenerateSBOM>
   </PropertyGroup>
 
   <!-- Nuget package properties https://docs.microsoft.com/en-us/nuget/reference/msbuild-targets -->