Remove unused field in LspServices

[mthalman]

When using the latest daily build of the .NET 10 SDK to build this repo, it results in the following errors:

/__w/1/vmr/src/razor/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/LspServices.cs(17,56): error IDE0052: Private member 'LspServices._startupServices' can be removed as the value assigned to it is never read (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0052) [/__w/1/vmr/src/razor/src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Microsoft.AspNetCore.Razor.LanguageServer.csproj]

/__w/1/vmr/src/razor/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/AutoInsert/RemoteAutoInsertService.cs(35,39): error IDE0052: Private member 'RemoteAutoInsertService._filePathService' can be removed as the value assigned to it is never read (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/ide0052) [/__w/1/vmr/src/razor/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/Microsoft.CodeAnalysis.Remote.Razor.csproj]

This is fixed by removing these unused fields.

[davidwengier]

Thanks for catching this!

One minor change needed before we can merge though

[davidwengier]

Also these should have broken our build too. Probably something we need to look into.

razor/.editorconfig

Line 43 in acde5a8

dotnet_diagnostic.IDE0052.severity = warning

razor/Directory.Build.props

Line 22 in acde5a8

<TreatWarningsAsErrors Condition="'$(CI)' == 'true'">true</TreatWarningsAsErrors>

[davidwengier]

Thanks Matt!

[davidwengier]

Created #11359 for follow up, so we don't break things in future