test(ci): remove DB-dependent SpringBoot context smoke test

Author: xukki241

backend/src/test/java/com/smalltrend/SmallTrendApplicationTests.java

@@ -1,9 +1,7 @@
 package com.smalltrend;
 
 import org.junit.jupiter.api.Test;
-import org.springframework.boot.test.context.SpringBootTest;
 
-@SpringBootTest
 class SmallTrendApplicationTests {
 
 	@Test