(core): false positive in check_xml_dependencies

Summary

After sight 21.0 update, sheldon report false positive about missing requirements in an AppConfig in those two cases:

1. use of a data/service defined in the same module
2. can not determine the target name when a service is defined in an app module

Steps to reproduce

• Add a space in Tuto04MeshGenerator AppConfig
• Stage the plugin.xml
• Run sheldon

Relevant logs and/or screenshots

Before fixing anything:

*** [ERROR] Dependency missing in tutorials/cpp/Tuto04MeshGeneratorCpp/rc/plugin.xml :
Could not determine service target
 ***

After fixing 1) we face problem 2)

*** [ERROR] Dependency missing in tutorials/cpp/Tuto04MeshGeneratorCpp/rc/plugin.xml :
- an object or service from 'sight::data' is used but the module is missing from the 'CMakeLists.txt' requirements.
- an object or service from 'Tuto04MeshGeneratorCpp' is used but the module is missing from the 'CMakeLis
ts.txt' requirements.
 ***

After fixing 2), only this remains:

*** [ERROR] Dependency missing in tutorials/cpp/Tuto04MeshGeneratorCpp/rc/plugin.xml :
- an object or service from 'sight::data' is used but the module is missing from the 'CMakeLists.txt' requirements.
 ***

Which is a real error and is going to be fixed elsewhere 😉 .