fix: 熔断enable接口会清空revision，导致客户端无法拉取更新

[andrewshan]

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[polaris-test-bot]

2023-03-10 19:42:22: =========TEST START==========
2023-03-10 19:42:52: Pre-Merge check success! Now we will perform a full automated test which is expected to take 2 hours, thank you for your patience.
2023-03-10 20:24:51: =========TEST START==========
2023-03-10 20:25:21: Pre-Merge check success! Now we will perform a full automated test which is expected to take 2 hours, thank you for your patience.
2023-03-10 20:40:41: [STANDALONE VERSION]PR autotest PASSED! We executed 20 test cases and 20 were passed. You can see test report in https://polaris-opentest-1306863770.cos.ap-guangzhou.myqcloud.com/pr1271045910/sta/qta-report.html
2023-03-10 20:40:45: [CLUSTER VERSION] PR autotest PASSED! We executed 20 test cases and 20 were passed. You can see test report in https://polaris-opentest-1306863770.cos.ap-guangzhou.myqcloud.com/pr1271045910/clu/qta-report.html
2023-03-10 20:40:49: [KUBENETES VERSION]PR autotest PASSED! We executed 20 test cases and 20 were passed. You can see test report in https://polaris-opentest-1306863770.cos.ap-guangzhou.myqcloud.com/pr1271045910/k8s/qta-report.html

[codecov]

Codecov Report

Merging #992 (3d4a943) into main (ba22dfc) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #992      +/-   ##
==========================================
- Coverage   57.95%   57.85%   -0.10%     
==========================================
  Files         187      187              
  Lines       35211    35292      +81     
==========================================
+ Hits        20405    20417      +12     
- Misses      12113    12192      +79     
+ Partials     2693     2683      -10     

Impacted Files	Coverage Δ
service/circuitbreaker_rule.go	40.30% <0.00%> (-0.63%)	⬇️

... and 12 files with indirect coverage changes

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