trim application name of old mapping content

[zrlw]

What is the purpose of the change

Since config service is unreliable, it's getConfig method might return a string that is ended by a space character,
so this PR want to

1. enhance ServiceNameMapping to avoid using untrimmed app names as mappedServices.
2. enhance MetadataServiceNameMapping to avoid registering duplicated service name mapping metadata.
   see [Feature] enhance service name mapping #14132

Brief changelog

1. trim and filter out empty app name at ServiceNameMapping#getAppNames, just like AbstractServiceNameMapping#parseServices.
2. trim old app name before comparison at MetadataServiceNameMapping#map.

Verifying this change

Checklist

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud