Improve error handling when the server hits an unrecoverable error (#…

…82376)

This has a few miscellaneous changes to improve process lifecycle stuff.

1. Update the support for named pipe as a process argument (LSP spec
details -
https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#implementationConsiderations)
to work better with the VSCode client
2. Ensure service broker bridge cancels properly if we need to stop the
process on our side to prevent lingering processes
3. Ensure the process reports errors when we encounter an exception in
the LSP queue that takes down the server. Previously the process would
cleanly exit even if we decided to shutdown due to an issue in the LSP
queue loop.

Needs to be paired with
dotnet/vscode-csharp#8982

Build Branch: refs/heads/release/insiders

Internal ID: 20260128.1
Internal VS ID: rel.insiders-11506.43

Build Branch: refs/heads/release/dev18.3

Internal ID: 20260128.5
Internal VS ID: rel.d18.3-11505.172

Roslyn VMR Version: 5.4.0-2.26069.105

VMR Commit SHA: ec846aee7f12180381c444dfeeba0c5022e1d110
VMR Internal ID: 20260119.105
SDK Tag: v11.0.100-preview.1.26104.118

Build Branch: refs/heads/release/dev18.0

Internal ID: 20260104.2
Internal VS ID: rel.d18.0-11430.68

Build Branch: refs/heads/release/dev17.14

Internal ID: 20250812.6
Internal VS ID: rel.d17.14-36930.00

Build Branch: refs/heads/release/dev18.3

Internal ID: 20260128.5
Internal VS ID: rel.d18.3-11429.125

Build Branch: refs/heads/release/dev17.12

Internal ID: 20250126.6
Internal VS ID: rel.d17.12-36929.03

LSP: Tolerate non-mutating requests where we are unable to determine …

…the language (#81660)

LSP: Tolerate non-mutating requests where we are unable to determine …

…the language (#81660)