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* upstream/main: (87 commits)
  Add support for nullable analysis in interpolated string handler constructors (dotnet#57780)
  Record list-patterns and newlines in interpolations as done (dotnet#58250)
  Swithc to acquiring the component model on a BG thread.
  Fix failure to propagate cancellation token
  [main] Update dependencies from dotnet/arcade (dotnet#58327)
  Change PROTOTYPE to issue reference (dotnet#58336)
  Resolve PROTOTYPE comments in param null checking (dotnet#58324)
  Address various minor param-nullchecking issues (dotnet#58321)
  Nullable enable GetTypeByMetadataName (dotnet#58317)
  Support CodeClass2.Parts returning parts in source generated files
  Allow the FileCodeModel.Parent to be null
  Ensure the CodeModel tests are using VisualStudioWorkspaceImpl
  Fix the bad words in TestDeepAlternation
  Fix regression in Equals/GetHashCode of LambdaSymbol. (dotnet#58247)
  Support "Enable nullable reference types" from disable keyword
  Support "Enable nullable reference types" from restore keyword
  Support "Enable nullable reference types" on the entire directive
  Add comment
  Remove descriptor
  Update src/Workspaces/Remote/ServiceHub/Services/SemanticClassification/RemoteSemanticClassificationService.cs
  ...