CgmesDLImportPostProcessor fix

[flo-dup]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Does this PR already have an issue describing the problem?
No

What kind of change does this PR introduce?
Bug fix

What is the current behavior?
File containing CGMES DL profile needs to have the exact same prefix as EQ profile file to be imported

What is the new behavior (if this is a feature change)?
CGMES DL data does not need to be in a specific file with a specific profile name.

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

[So-Fras]

Is there an easy way to refactor the CgmesDLModelTest > setUp() and/or CgmesDLModelTest > setQuery(...) functions to be able to test the CgmesDLImporter > import[...]DLData()empty cases? Or maybe use parametrized tests?

[sonarcloud]

Quality Gate failed

Failed conditions
76.9% Coverage on New Code (required ≥ 90%)

See analysis details on SonarCloud