fix Panic caused by failure to connect to the peer when obtaining remote metadata

[FoghostCn]

fix #2650
fix Panic caused by failure to connect to the peer when obtaining remote metadata

The callback function of the registration center will not be interrupted when an error occurs in obtaining remote metadata.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 47.38%. Comparing base (2f5143a) to head (e5e3b00).
Report is 4 commits behind head on main.

❗ Current head e5e3b00 differs from pull request most recent head 45be6f7. Consider uploading reports for the commit 45be6f7 to get more accurate results

Files	Patch %	Lines
...try/servicediscovery/service_discovery_registry.go	0.00%	4 Missing ⚠️
...ta/service/local/metadata_service_proxy_factory.go	0.00%	1 Missing and 1 partial ⚠️
...scovery/service_instances_changed_listener_impl.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2651   +/-   ##
=======================================
  Coverage   47.38%   47.38%           
=======================================
  Files         341      341           
  Lines       25122    25131    +9     
=======================================
+ Hits        11904    11909    +5     
+ Misses      12074    12071    -3     
- Partials     1144     1151    +7     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
2.6% Duplication on New Code

See analysis details on SonarCloud

[chickenlj]

LGTM.