* origin/master: (134 commits)
  Fix isTypeOfExpression in compiler API (microsoft#20875). (microsoft#20884)
  add completion filter for function like body (microsoft#21257)
  Make nonnull assertions and binding patterns apparent declared type locations (microsoft#20995)
  For `{ type: "a" } | { type: "b" }`, find references for the union property (microsoft#21298)
  configureNightly -> configurePrerelease
  Create a 'configure-insiders' and 'publish-insiders' task.
  Add createProgram on WatchCompilerHost
  in goToDefinition, use array helpers and clean up code (microsoft#21304)
  Support testing definition range of a reference gruop (microsoft#21302)
  Handle `undefined` input to firstDefined (microsoft#21300)
  Avoid spreading array (microsoft#21291)
  LEGO: check in for master to temporary branch.
  Accept new baselines
  Add regression test
  Properly handle contravariant inferences in inferReverseMappedType
  Remove unused properties from interface Refactor (microsoft#21286)
  LEGO: check in for master to temporary branch.
  Fold newline logic into getNewLineOrDefaultFromHost
  External test runner updates (microsoft#21276)
  Report more detailed info during script debug failure
  ...