Remove added packages and pnpm overrides, keep only version upgrades

Co-authored-by: v-jiaodi <80496810+v-jiaodi@users.noreply.github.com>

Author: Copilot

package.json

@@ -30,11 +30,7 @@
     "pnpm": ">=10.12.1"
   },
   "pnpm": {
-    "overrides": {
-      "@typespec/sse": "^0.77.0",
-      "@typespec/events": "^0.77.0",
-      "@typespec/streams": "^0.77.0"
-    },
+    "overrides": {},
     "ignoredBuiltDependencies": [
       "esbuild"
     ],

packages/typespec-test/package.json

@@ -12,13 +12,9 @@
     "@azure-tools/typespec-azure-resource-manager": "^0.63.0",
     "@azure-tools/typespec-azure-rulesets": "^0.63.0",
     "@typespec/compiler": "^1.7.0",
-    "@typespec/events": "^0.77.0",
     "@typespec/http": "^1.7.0",
     "@typespec/rest": "^0.77.0",
-    "@typespec/sse": "^0.77.0",
-    "@typespec/streams": "^0.77.0",
     "@typespec/versioning": "^0.77.0",
-    "@typespec/xml": "^0.77.0",
     "@typespec/json-schema": "^1.7.0",
     "prettier": "^3.1.0"
   },

packages/typespec-ts/package.json

@@ -88,15 +88,11 @@
     "@typescript-eslint/eslint-plugin": "^8.28.0",
     "@typescript-eslint/parser": "^8.28.0",
     "@typespec/compiler": "^1.7.0",
-    "@typespec/events": "^0.77.0",
     "@typespec/http": "^1.7.0",
     "@typespec/openapi": "^1.7.0",
     "@typespec/rest": "^0.77.0",
-    "@typespec/sse": "^0.77.0",
-    "@typespec/streams": "^0.77.0",
     "@typespec/ts-http-runtime": "^0.1.0",
     "@typespec/versioning": "^0.77.0",
-    "@typespec/xml": "^0.77.0",
     "chai": "^4.3.6",
     "chalk": "^4.0.0",
     "cross-env": "^7.0.3",
@@ -118,25 +114,11 @@
     "@azure-tools/typespec-azure-core": "^0.63.0",
     "@azure-tools/typespec-client-generator-core": "^0.63.0",
     "@typespec/compiler": "^1.7.0",
-    "@typespec/events": "^0.77.0",
     "@typespec/http": "^1.7.0",
     "@typespec/rest": "^0.77.0",
-    "@typespec/sse": "^0.77.0",
-    "@typespec/streams": "^0.77.0",
     "@typespec/versioning": "^0.77.0",
     "@typespec/xml": "^0.77.0"
   },
-  "peerDependenciesMeta": {
-    "@typespec/sse": {
-      "optional": true
-    },
-    "@typespec/events": {
-      "optional": true
-    },
-    "@typespec/streams": {
-      "optional": true
-    }
-  },
   "dependencies": {
     "@azure-tools/rlc-common": "workspace:^0.47.0",
     "fs-extra": "^11.1.0",