[-] Completely drop mysql support

src/test/resources/application-testMysql.properties

@@ -1,18 +0,0 @@
-# For testing
-## AimeDb server setting
-aimedb.server.enable=true
-aimedb.server.port=22345
-allnet.server.host=localhost
-allnet.server.port=80
-aimedb.server.address=127.0.0.1
-billing.server.enable=true
-billing.server.port=8443
-## Http Server Port
-server.port=80
-spring.flyway.clean-disabled=false
-spring.flyway.locations=classpath:db/migration/mysql
-spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
-spring.datasource.username=aqua_test
-spring.datasource.password=aqua_test
-spring.datasource.url=jdbc:mysql://localhost:13306/aqua_test?useSSL=false&allowPublicKeyRetrieval=true
-spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect