Build and Deploy Job failed after adding ESLint and Prettier to API

**Describe the bug**

I am trying to configure the API project built with TypeScript with ESLint and Prettier but after I add it the "Build and Deploy Job" is failed with this message:

```
The function language detected is unsupported or invalid. The following languages are valid: dotnet, dotnetisolated, node, python. If you are not using Azure Functions, you can skip this check by removing the 'api_location' input from the workflow file.
```

**To Reproduce**
Here are the steps I've taken on setting up the ESLint and Prettier:
1. Install ESLint, Prettier, and its plugins
```zsh
npm i -D @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint \
eslint-config-airbnb-base eslint-config-airbnb-typescript \
eslint-config-prettier eslint-plugin-import eslint-plugin-prettier prettier
```
2. Run `eslint --init` to generate `.eslintrc.js`

**Difference in project files**

#### .eslintrc.js
```diff
+ module.exports = {
+ "env": {
+ "es2021": true,
+ "node": true
+ },
+ "parser": "@typescript-eslint/parser",
+ "parserOptions": {
+ "ecmaVersion": 12,
+ "sourceType": "module"
+ },
+ "plugins": [
+ "@typescript-eslint"
+ ],
+ "rules": {
+ }
+ };
```

#### package.json

```diff
"start:host": "func start",
"start": "npm-run-all --parallel start:host watch",
"test": "jest",
- "generate-spec": "tsoa spec"
+ "generate-spec": "tsoa spec",
+ "lint": "eslint .",
+ "format": "prettier --write './**/*.{js,ts,css,md,json}' --config ./.prettierrc"
},
"description": "",
"devDependencies": {
@@ -20,9 +22,18 @@
"@babel/preset-typescript": "^7.15.0",
"@types/jest": "^27.0.2",
"@types/node": "^16.11.3",
+ "@typescript-eslint/eslint-plugin": "^5.3.1",
+ "@typescript-eslint/parser": "^5.3.1",
"babel-jest": "^27.3.1",
+ "eslint": "^7.32.0",
+ "eslint-config-airbnb-base": "^14.2.1",
+ "eslint-config-airbnb-typescript": "^15.0.0",
+ "eslint-config-prettier": "^8.3.0",
+ "eslint-plugin-import": "^2.25.2",
+ "eslint-plugin-prettier": "^4.0.0",
"jest": "^27.2.4",
"npm-run-all": "^4.1.5",
+ "prettier": "^2.4.1",
"ts-jest": "^27.0.5",
"typescript": "^4.4.4"
},
```

**Expected behavior**
- ESLint and Prettier can help me lint, format, and enforce code styles
- "Build and Deploy Job" can run and deploy without any errors.

**Additional context**
- API project is generated with `func new`
- I've run `eslint .` before triggering the job to ensure that the error does not relate to the code styles
- In the reproducing part - I've installed many plugins along with the `eslint` and `prettier` but the reason I'm not using them in the `.eslintrc.js` is also to ensure that the error does not relate to the code styles (enforced by the plugins)