Remove language server telemetry

[Shenglong Li (shenglol)]

Summary

• remove telemetry events, providers, handlers, and dependency injection from Bicep.LangServer
• retain user-facing command error handling through a telemetry-free helper
• remove telemetry-only protocol fields, tests, mocks, assertions, and completion baseline data

This follows the removal of telemetry from vscode-bicep and eliminates the now-unused server-side telemetry path.

Validation

• dotnet build src\Bicep.LangServer\Bicep.LangServer.csproj --no-restore
• dotnet build src\Bicep.LangServer.UnitTests\Bicep.LangServer.UnitTests.csproj --no-restore
• 358 targeted language server unit/integration tests
• 183 completion integration tests
• npm run build in src\vscode-bicep

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 32319173715)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 32319173715

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 32319173715"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 32319173715

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 32319173715"