Add junit5 test code for module [linkis-variable]

[ruY9527]

Add junit5 test code for module [linkis-variable]

• Module: linkis-variable
• Location:linkis-public-enhancements/linkis-variable
• Task status:✗(unfinished)/ ✓(finished)
• Test code guide:https://linkis.apache.org/zh-CN/community/how-to-write-unit-test-code/

• Test code example: https://github.com/apache/incubator-linkis/tree/master/linkis-public-enhancements/linkis-publicservice/linkis-jobhistory/src/test

• 模块名: linkis-variable
• 代码位置:linkis-public-enhancements/linkis-variable
• 任务状态:✗(unfinished)/ ✓(finished)
• 单测编写指引:https://linkis.apache.org/zh-CN/community/how-to-write-unit-test-code/
• 参考样例: https://github.com/apache/incubator-linkis/tree/master/linkis-public-enhancements/linkis-publicservice/linkis-jobhistory/src/test

Task status	Class	Type	Level of Difficulty	Note
✓	org.apache.linkis.variable.dao.*	Builder	normal
✓	org.apache.linkis.variable.service.*	service	normal
✓	org.apache.linkis.variable.restful.api.VariableRestfulApi	service	normal
✗	org.apache.linkis.variable.exception.VariableException	exception	normal
✗	org.apache.linkis.variable.util.Constants	util	normal

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