chore: improve hugegraph-client ut & stabilize hugegraph-client-ci

[simon824]

refer to https://github.com/apache/incubator-hugegraph-toolchain/actions/runs/3383405590/jobs/5619268055

Error:  Tests run: 100, Failures: 2, Errors: 0, Skipped: 0, Time elapsed: 207.147 s <<< FAILURE! - in com.baidu.hugegraph.functional.FuncTestSuite
Error:  testAddVertexLabelWithUserData(com.baidu.hugegraph.functional.VertexLabelTest)  Time elapsed: 0.539 s  <<< FAILURE!
java.lang.AssertionError
	at com.baidu.hugegraph.functional.VertexLabelTest.testAddVertexLabelWithUserData(VertexLabelTest.java:60)

Error:  testAddEdgeLabelWithUserData(com.baidu.hugegraph.functional.EdgeLabelTest)  Time elapsed: 2.563 s  <<< FAILURE!
java.lang.AssertionError
	at com.baidu.hugegraph.functional.EdgeLabelTest.testAddEdgeLabelWithUserData(EdgeLabelTest.java:97)

[codecov]

Codecov Report

Merging #355 (9df7760) into master (6374d5f) will increase coverage by 34.70%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master     #355       +/-   ##
=============================================
+ Coverage      0.00%   34.70%   +34.70%     
- Complexity        0      966      +966     
=============================================
  Files            86      255      +169     
  Lines          4031     9089     +5058     
  Branches        478      837      +359     
=============================================
+ Hits              0     3154     +3154     
- Misses         4031     5756     +1725     
- Partials          0      179      +179     

Impacted Files	Coverage Δ
.../hugegraph/loader/flink/HugeGraphOutputFormat.java	0.00% <0.00%> (ø)
...com/baidu/hugegraph/api/schema/VertexLabelAPI.java	86.48% <0.00%> (ø)
...om/baidu/hugegraph/structure/auth/AuthElement.java	100.00% <0.00%> (ø)
...main/java/com/baidu/hugegraph/util/CommonUtil.java	93.75% <0.00%> (ø)
...m/baidu/hugegraph/structure/auth/HugeResource.java	62.50% <0.00%> (ø)
...aidu/hugegraph/api/traverser/TemplatePathsAPI.java	100.00% <0.00%> (ø)
...om/baidu/hugegraph/structure/schema/EdgeLabel.java	68.13% <0.00%> (ø)
...ava/com/baidu/hugegraph/structure/auth/Target.java	62.50% <0.00%> (ø)
...u/hugegraph/structure/traverser/WeightedPaths.java	100.00% <0.00%> (ø)
.../baidu/hugegraph/structure/constant/IndexType.java	73.33% <0.00%> (ø)
... and 160 more

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