non-project file, only JDK classes are added to its build path

[provide a description of the issue]

Environment

• Operating System: window 11
• JDK version: 17
• Visual Studio Code version: 1.90
• Java extension version: v0.27.0

Steps To Reproduce

1. [step 1] clone project
2. [step 2] set datasource (/redisChat/src/main/resources/application.yml)
   (I was using h2 in this project.)
3. [step 3] run redisChatApplication.java

[Please attach a sample project reproducing the error]
https://github.com/0gon/hung_chit_chat
[Please attach logs]

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
        SpringApplication cannot be resolved

        at com.redis.redisChat.demo.RedisChatApplication.main(RedisChatApplication.java:10)

Current Results

Added two modules to practice the msa method. kafkaChat, redischat.
It works fine on the pc that created the project, but I try to clone it and run it on another pc, so I can't get spring boot dependency.

Estimated results

Maybe when I clone it, I don't think I recognize the folder as a module or project, but as a simple folder.

I've looked in many directions. But I'm sorry I'm a beginner, and I don't know any more because I lack clues.

Additional Informations

リンクされている hung_chit_chat プロジェクト、そのモジュール、および redisChat/src/main/resources/application.yml から始め、報告されている JDK と拡張機能のバージョンを使用して、VS Code で RedisChatApplication.java を実行します。クローンしたプロジェクトの動作を、報告されている未解決の SpringApplication エラーと比較します。Spring Boot の依存関係が不足している原因、またはプロジェクトが認識されない原因が文書化され、クローンしたアプリケーションが依存関係を解決できれば完了です。