Remove distinction between CI lint and local lint (microsoft#36430)

Author: weswigham

Gulpfile.js

@@ -346,8 +346,6 @@ const lintFoldEnd = async () => { if (fold.isTravis()) console.log(fold.end("lin
 
 /** @type { (folder: string) => { (): Promise<any>; displayName?: string } } */
 const eslint = (folder) => async () => {
-    const ESLINTRC_CI = ".eslintrc.ci.json";
-    const isCIEnv = cmdLineOptions.ci || process.env.CI === "true";
 
     const args = [
         "node_modules/eslint/bin/eslint",
@@ -358,13 +356,6 @@ const eslint = (folder) => async () => {
         "--ext", ".ts",
     ];
 
-    if (
-        isCIEnv &&
-        fs.existsSync(path.resolve(folder, ESLINTRC_CI))
-    ) {
-        args.push("--config", path.resolve(folder, ESLINTRC_CI));
-    }
-
     if (cmdLineOptions.fix) {
         args.push("--fix");
     }

src/.eslintrc.ci.json

@@ -1,5 +1,13 @@
 {
     "extends": "../.eslintrc.json",
+    "parserOptions": {
+        "tsconfigRootDir": "src",
+        "project": "./tsconfig-base.json"
+    },
+    "rules": {
+        "@typescript-eslint/no-unnecessary-qualifier": "error",
+        "@typescript-eslint/no-unnecessary-type-assertion": "error"
+    },
     "overrides": [
         {
             "files": ["lib/*.d.ts"],