* upstream/main: (233 commits)
  Extensions: add SyntaxGenerator support and AssociatedExtensionImplementation API (dotnet#80170)
  Fix error when hoisting a non-ref call (dotnet#80138)
  Ensure that refkinds are rewritten for complex methods (dotnet#79916)
  Revert
  Do not go through the workspace to access services
  DefiniteAssignmentPass.MarkFieldsUsed - avoid infinite recursion due to generic substitution (dotnet#80135)
  Reduce allocations in AnalyzerDriver.TryExecuteSymbolEndActions (dotnet#79855)
  RefSafetyAnalysis: Fix handling of nested deconstruction utilizing modern extensions (dotnet#80231)
  Extensions: adjust rewriting of anonymous type property symbols (dotnet#80211)
  Extensions: Move public APIs into INamedTypeSymbol (dotnet#80230)
  Extensions: improve error recovery in older language versions (dotnet#80206)
  Fall back to `dotnet exec` if apphost does not exist (dotnet#80153)
  Update dependencies from https://github.com/dotnet/dotnet build 282708 (dotnet#80228)
  Add a workaround for microsoft/vs-mef#620
  Revert "FailFast if the MEF composition is clearly broken"
  switch from windows combobox to visualstudio combobox (dotnet#80219)
  Update System.Text.Json in packages which use 4.12 Roslyn (dotnet#80197)
  add flags to unblock CI (dotnet#80222)
  Move static members to another type - qualifies static member references in the moved members (dotnet#80178)
  Fix broken link for C# 14 lambda parameter modifiers
  ...