修复nacos服务发现clusters逻辑兼容问题

[qnnn]

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

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

[polaris-test-bot]

2024-02-21 19:16:14: =========TEST START==========

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c4ae7cf) 54.95% compared to head (4959c66) 54.96%.

Files	Patch %	Lines
apiserver/nacosserver/core/storage.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1329 +/- ## ======================================= Coverage 54.95% 54.96% ======================================= Files 209 209 Lines 40400 40399 -1 ======================================= + Hits 22202 22205 +3 + Misses 15559 15557 -2 + Partials 2639 2637 -2 ```

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