[linkis-variable][restful]Add VariableRestfulApi unit test

[binbinCheng]

module:linkis-variable path:linkis-public-enhancements/linkis-publicservice/linkis-variable/src/main/java/org/apache/linkis/variable/restful class:org.org.apache.linkis.variable.restful.api.VariableRestfulApi Add VariableRestfulApiunit test

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