Add flag --delete-file-after-copy-in-source in azcopy

[Rbsn-joses]

I'm using azcopy and it would be great to have the flag to remove files after successfully copying them, it would make sense for migrations of large quantities by date, as for large volumes the copy can take hours until the azcopy remove step runs to remove the same files that were copied.

azcopy copy {STORAGE_ACCOUNT} {STORAGE_ACCOUNT} --include-before 2020-08-19T15:04:00Z --delete-file-after-copy-in-source