Code cleanup in MdnsInterfaceAdvertiser, MdnsReplySender, MdnsUtils

* Update getRawOffloadPayload() with @NonNull annotation.
* Log the error object directly instead of logging the error message.
* Use Arrays.copyOfRange() instead of System.arraycopy().
* Remove the unnecessary escape of mPacketCreationBuffer member variable in MdnsReplySender.

Bug: 308079421
Test: TH
Change-Id: I8c805bfe1fc1ae1d9a8abfab498059bda05710ff