增强eureka delta api的稳定性

[MI-cool]

Please provide issue(s) of this PR: Fixes #1249

To help us figure out who should review this PR, please put an X in all the areas that this PR affects.

• [x] ApiServer
• [ ] Auth
• [ ] Configuration
• [ ] Naming
• [ ] HealthCheck
• [ ] Metrics
• [ ] Docs
• [ ] Installation
• [ ] Performance and Scalability
• [ ] Test and Release

Please check any characteristics that apply to this pull request.

• [x] Does not have any user-facing changes. This may include API changes, behavior changes, performance improvements, etc.

[polaris-test-bot]

2023-09-12 15:31:21: =========TEST START========== 2023-09-12 16:01:16: [STANDALONE VERSION]PR autotest FAILED! We executed 47 test cases and 42 were passed. You can see test report in https://polaris-opentest-1306863770.cos.ap-guangzhou.myqcloud.com/pr1511537499/sta/qta-report.html and https://polaris-opentest-1306863770.cos.ap-guangzhou.myqcloud.com/pr1511537499/sta/ratelimit/qta-report.html 2023-09-12 16:01:20: [CLUSTER VERSION] PR autotest FAILED! We executed 39 test cases and 35 were passed. You can see test report in https://polaris-opentest-1306863770.cos.ap-guangzhou.myqcloud.com/pr1511537499/clu/qta-report.html 2023-09-12 16:01:24: [KUBENETES VERSION]PR autotest FAILED! We executed 39 test cases and 37 were passed. You can see test report in https://polaris-opentest-1306863770.cos.ap-guangzhou.myqcloud.com/pr1511537499/k8s/qta-report.html

[chuntaojun]

LGTM

[codecov[bot]]

Codecov Report

Merging #1250 (9a611cd) into main (97e3066) will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1250      +/-   ##
==========================================
- Coverage   55.81%   55.80%   -0.02%     
==========================================
  Files         179      179              
  Lines       32442    32456      +14     
==========================================
+ Hits        18107    18111       +4     
- Misses      11978    11988      +10     
  Partials     2357     2357              

Files Changed	Coverage Δ
apiserver/eurekaserver/delta_worker.go	76.07% <100.00%> (+1.25%)	:arrow_up:

... and 10 files with indirect coverage changes

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more