NEXUS-6139, NEXUS-6138: Evict delete operation and copy options

Modified the evict processor's delete operation to not put files into trash, but delete them instantly instead.
Also, removed the options muck from DirSupport, as only the REPLACE_EXISTING was actually used.

Related issues
https://issues.sonatype.org/browse/NEXUS-6138
https://issues.sonatype.org/browse/NEXUS-6139

CI
TBD