[ISSUE #3275] improve unit test coverage of 'org.apache.shenyu.common.utils'

[xcsnx]

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

Merging #4223 (8c7595f) into master (35c30d0) will increase coverage by 0.09%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4223      +/-   ##
============================================
+ Coverage     70.56%   70.66%   +0.09%     
- Complexity     7254     7267      +13     
============================================
  Files           971      971              
  Lines         27083    27083              
  Branches       2408     2408              
============================================
+ Hits          19110    19137      +27     
+ Misses         6512     6482      -30     
- Partials       1461     1464       +3     

Impacted Files	Coverage Δ
...java/org/apache/shenyu/common/utils/PathUtils.java	50.00% <0.00%> (ø)
...java/org/apache/shenyu/common/utils/GsonUtils.java	66.06% <0.00%> (+1.21%)	⬆️
...henyu/plugin/grpc/resolver/ShenyuNameResolver.java	62.76% <0.00%> (+8.51%)	⬆️
...java/org/apache/shenyu/common/utils/JsonUtils.java	67.30% <0.00%> (+11.53%)	⬆️
...ruptor/RegisterClientServerDisruptorPublisher.java	64.70% <0.00%> (+11.76%)	⬆️
...java/org/apache/shenyu/common/utils/SignUtils.java	100.00% <0.00%> (+15.78%)	⬆️
...controller/ShenyuClientHttpRegistryController.java	100.00% <0.00%> (+22.22%)	⬆️
.../java/org/apache/shenyu/common/utils/UriUtils.java	78.57% <0.00%> (+28.57%)	⬆️

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