* VAULT-6818 delete unmerged entity aliases instead of orphaning them
* VAULT-6818 Prevent merge with clashing aliases, allow for resolution of clashing entity aliases
* VAULT-6818 Small updates
* VAULT-6818 Restrict to only one clash merge at once
* VAULT-6818 changelog
* VAULT-6818 use strutil package instead of slices
* VAULT-6818 Update variable names for clarity
* VAULT-6818 Update test
* VAULT-6818 update error message
* VAULT-6818 Use helper method
* VAULT-6818 validate entityIds
* VAULT-6818 group imports better
* VAULT-6818 use change instead of bug
* VAULT-6818 use multierror instead of custom struct
* VAULT-6818 Use multierror properly
* VAULT-6818 Small refactor based on feedback
