Remove calls to verify_digest_pushed in _sandboxremote.
Background
The calls to verify_digest_pushed in SandboxRemote's methods run_remote_command and run do not do anything useful. Each is proceeded by either a cascache.push_directory or cascache.push_message which would throw an exception if they failed to push, so if the push operation failed in any way, we would never reach verify_digest_pushed.
Task description
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Remove calls to verify_digest_pushedinSandboxRemote
Acceptance Criteria
Equivalent functionality demonstrated by remote execution test.