[Discovery] HttpLongPolling Sync DiscoveryData

[ywj1352]

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• 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 #4795 (6cc8807) into master (a5a0779) will increase coverage by 0.05%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master    #4795      +/-   ##
============================================
+ Coverage     65.21%   65.26%   +0.05%     
- Complexity     8138     8151      +13     
============================================
  Files          1136     1138       +2     
  Lines         33374    33425      +51     
  Branches       2975     2975              
============================================
+ Hits          21765    21815      +50     
- Misses         9878     9883       +5     
+ Partials       1731     1727       -4     

Impacted Files	Coverage Δ
...yu/admin/listener/AbstractDataChangedListener.java	81.39% <0.00%> (-13.20%)	⬇️
...tener/http/HttpLongPollingDataChangedListener.java	5.69% <0.00%> (-0.20%)	⬇️
...he/shenyu/admin/model/dto/ProxySelectorAddDTO.java	19.04% <0.00%> (-0.96%)	⬇️
...u/admin/service/impl/ProxySelectorServiceImpl.java	20.23% <0.00%> (ø)
...ata/http/refresh/DiscoveryUpstreamDataRefresh.java	42.85% <42.85%> (ø)
...u/sync/data/http/refresh/ProxySelectorRefresh.java	42.85% <42.85%> (ø)
...rter/sync/data/http/HttpSyncDataConfiguration.java	84.21% <100.00%> (+1.85%)	⬆️
...che/shenyu/sync/data/http/HttpSyncDataService.java	90.81% <100.00%> (+29.59%)	⬆️
...nyu/sync/data/http/refresh/DataRefreshFactory.java	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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