support RegistryInstance in `get_all_non_jll_package_names` #1172

Job	Run time
Documentation	2m 0s
Doctests	2m 0s
Unit/Julia 1.3/ubuntu-latest/x64	7m 55s
Unit/Julia 1.4/ubuntu-latest/x64	8m 53s
Unit/Julia 1.5/ubuntu-latest/x64	7m 52s
Unit/Julia 1.6/ubuntu-latest/x64	5m 26s
Unit/Julia 1.7/ubuntu-latest/x64	5m 58s
Unit/Julia 1.8/ubuntu-latest/x64	5m 16s
Unit/Julia 1/ubuntu-latest/x64	5m 31s
Unit/Julia nightly/ubuntu-latest/x64	1m 29s
	52m 20s

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