Add .lscache from c# dev kit got VisualStudio.gitignore

[tiger31]

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C# Dev Kit VSCode Extension

Reasons for making this change

Those cache files are not valid for cross-platform build, especially on NixOS systems

Links to documentation supporting these rule changes

vscode-dotnettools repo discussion
It's the same place https://aka.ms/lscache redirects

Merge and Approval Steps

• I have read the contribution guidelines and understand my PR will be closed if it doesn't meet these guidelines

[tiger31]

To add more context:

In their issue they state:

What if I don't want them in source control? We'd encourage you to try checking them in and experience the benefits, but we understand not every team will want that. You can add .lscache to your .gitignore if you prefer. You'll still get the per-machine caching benefits (warm starts when reopening the same project), you just won't get the cross-machine and branch-switching benefits. We're exploring configuration options to give users more control here.

Sample of an .lscache file produced on my system (Linux nixos 6.12.87)

[analyzerReferences]
../../../../../../../nix/store/0r8iidkhy8ky5nak95nsl3x05i33qbdb-dotnet-combined/share/dotnet/packs/Microsoft.AspNetCore.App.Ref/8.0.26/analyzers/dotnet/cs/
 Microsoft.AspNetCore.App.Analyzers.dll
 Microsoft.AspNetCore.App.CodeFixes.dll
 Microsoft.AspNetCore.Components.Analyzers.dll
../../../../../../../nix/store/0r8iidkhy8ky5nak95nsl3x05i33qbdb-dotnet-combined/share/dotnet/packs/Microsoft.AspNetCore.App.Ref/8.0.26/analyzers/dotnet/roslyn4.4/cs/
 Microsoft.Extensions.Logging.Generators.dll
 Microsoft.Extensions.Options.SourceGeneration.dll
../../../../../../../nix/store/0r8iidkhy8ky5nak95nsl3x05i33qbdb-dotnet-combined/share/dotnet/packs/Microsoft.NETCore.App.Ref/8.0.26/analyzers/dotnet/cs/
 Microsoft.Interop.ComInterfaceGenerator.dll
 Microsoft.Interop.JavaScript.JSImportGenerator.dll
 Microsoft.Interop.LibraryImportGenerator.dll
 Microsoft.Interop.SourceGeneration.dll
 System.Text.Json.SourceGeneration.dll
 System.Text.RegularExpressions.Generator.dll
../../../../../../../nix/store/0r8iidkhy8ky5nak95nsl3x05i33qbdb-dotnet-combined/share/dotnet/sdk/8.0.420/Sdks/Microsoft.NET.Sdk/analyzers/
 Microsoft.CodeAnalysis.CSharp.NetAnalyzers.dll
 Microsoft.CodeAnalysis.NetAnalyzers.dll
<NUGET>/awssdk.apigateway/3.7.300.71/analyzers/dotnet/cs/
 AWSSDK.APIGateway.CodeAnalysis.dll
 SharedAnalysisCode.dll
<NUGET>/microsoft.codeanalysis.analyzers/3.3.3/analyzers/dotnet/cs/
 Microsoft.CodeAnalysis.Analyzers.dll
 Microsoft.CodeAnalysis.CSharp.Analyzers.dll
<NUGET>/microsoft.entityframeworkcore.analyzers/8.0.2/analyzers/dotnet/cs/Microsoft.EntityFrameworkCore.Analyzers.dll

[analyzerConfigFiles]
../../../../../../../nix/store/0r8iidkhy8ky5nak95nsl3x05i33qbdb-dotnet-combined/share/dotnet/sdk/8.0.420/Sdks/Microsoft.NET.Sdk/analyzers/build/config/analysislevel_8_default.globalconfig
obj/Debug/net8.0/Workflow.GeneratedMSBuildEditorConfig.editorconfig

Those ../nix/store/ paths won't exist unless the system is built from the same configuration with same packages versions

[tiger31]

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