fix: exclude dumpLocation volumes nested in the mountDir (#524)

Description

• exclude dumpLocation volumes nested in the mountDir.
• automatically mount dumpLocation to the auxiliary containers

This fix resolves the issue when a lot of mounts are created (can be checked with mount | wc -l) – sometimes thousands – slowing down all ZFS operations.

Related issue

#524 (closed)

Examples

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc)
• MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED

Closes #524 (closed)