[MSHADE-413] Fix endless loop caused by manipulating shared objects

[snazy]

JIRA issue: MSHADE-413
May be fixing MNG-7096, MSHADE-148, MSHADE-384...

Maven objects (like Dependency or Model) returned by Maven must not
be modified. Doing so will result in endless loops or incorrect builds.

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[snazy]

Prefixed the PR with a separate commit that just contains the integration test that reproduces the infinite loop.

[gnodet]

LGTM as modifying the object model should definitely be forbidden.