When the service source type is nacos3, if mcpserver is turned off, then the discovery mechanism of nacos2 will be enabled

[johnlanni]

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.63%. Comparing base (ef31e09) to head (c7e80c0).
Report is 600 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2150      +/-   ##
==========================================
+ Coverage   35.91%   45.63%   +9.72%     
==========================================
  Files          69       79      +10     
  Lines       11576    12895    +1319     
==========================================
+ Hits         4157     5885    +1728     
+ Misses       7104     6661     -443     
- Partials      315      349      +34     

see 77 files with indirect coverage changes

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