[MRM-747] Archiva should prevent re-deployment of released or non-snapshot versioned artifacts
submitted by Marc Lustig
o added checks in webdav to block re-deployment if artifact version already exists in the repo and throw a 409 in such cases
o added tests for deploying and re-deploying an artifact
additional modifications to the patch:
o update checking for artifact types that will be blocked
o add tests for deploying metadata and support file
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