Add spector update skill

cspell.yaml

@@ -254,6 +254,7 @@ words:
   - ssvs
   - statment
   - strs
+  - stubbed
   - swaggerui
   - syncpack
   - TCGC
@@ -289,6 +290,7 @@ words:
   - unprojected
   - unrepresentable
   - unsourced
+  - unstubbed
   - unversioned
   - venv
   - venvtools

packages/http-client-csharp/eng/scripts/Spector-Helper.psm1

@@ -6,6 +6,8 @@ $failingSpecs = @(
   Join-Path 'http' 'type' 'file'
   Join-Path 'http' 'client' 'naming' # pending until https://github.com/microsoft/typespec/issues/5653 is resolved
   Join-Path 'http' 'streaming' 'jsonl'
+  Join-Path 'http' 'type' 'union' 'discriminated' # pending design
+  Join-Path 'http' 'authentication' 'noauth' 'union' # pending design
 )
 
 $azureAllowSpecs = @(

packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Properties/launchSettings.json

@@ -10,11 +10,6 @@
       "commandName": "Executable",
       "executablePath": "$(SolutionDir)/../dist/generator/Microsoft.TypeSpec.Generator.exe"
     },
-    "http-authentication-noauth-union": {
-      "commandLineArgs": "$(SolutionDir)/TestProjects/Spector/http/authentication/noauth/union -g StubLibraryGenerator",
-      "commandName": "Executable",
-      "executablePath": "$(SolutionDir)/../dist/generator/Microsoft.TypeSpec.Generator.exe"
-    },
     "http-authentication-oauth2": {
       "commandLineArgs": "$(SolutionDir)/TestProjects/Spector/http/authentication/oauth2 -g StubLibraryGenerator",
       "commandName": "Executable",
@@ -295,11 +290,6 @@
       "commandName": "Executable",
       "executablePath": "$(SolutionDir)/../dist/generator/Microsoft.TypeSpec.Generator.exe"
     },
-    "http-type-union-discriminated": {
-      "commandLineArgs": "$(SolutionDir)/TestProjects/Spector/http/type/union/discriminated -g StubLibraryGenerator",
-      "commandName": "Executable",
-      "executablePath": "$(SolutionDir)/../dist/generator/Microsoft.TypeSpec.Generator.exe"
-    },
     "http-versioning-added-v1": {
       "commandLineArgs": "$(SolutionDir)/TestProjects/Spector/http/versioning/added/v1 -g StubLibraryGenerator",
       "commandName": "Executable",