PTFM-12335 Test for rejecting private key upload
PTFM-12040 dx ssh test
Ingest at most one argument in dx run --allow-ssh

Previously, "dx run --allow-ssh ..." would consume all subsequent
non-optionals, including potentially the executable. This allows
commands like "dx run --allow-ssh '*' bwa" to behave as expected (but
not "dx run --allow-ssh bwa").
Correctly handle empty value in 8245dac
Ignore .arcconfig
Changelog and version updates for v0.105.0