Fix artifact relocation support

[slawekjaranowski]

• Update ITs for copy, unpack, and relocation use cases.
• Simplify and align artifact verification in integration tests.

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[hboutemy]

if this is a fix, it means something was not working as expected?
what was expected that actual was not ok?

it's hard to review

[slawekjaranowski]

@hboutemy it fix linked issue

reproduce:
add src/it/mrm/repository/ResourceArtifact-relocation-1.0.pom artifact with relocation information

next it is used in src/it/projects/copy-relocation/pom.xml and in verification src/it/projects/copy-relocation/verify.groovy we see that artifact ResourceArtifact-1.0.jar was used - so information about relocation was consider

[hboutemy]

ok, I did not see linked issue: I'm definitively lost with GH issues...
thanks