Enable MemberImportVisibility check on all targets #17

Job	Run time
Soundness / Check generated code	41s
Cxx interop / Construct Cxx interop matrix	10s
Soundness / Swift license headers check	5s
Unit tests / Construct unit test matrix	9s
Soundness / API breakage check	1m 38s
Soundness / Documentation check	1m 18s
Soundness / Broken symlinks check	5s
Soundness / Format check	35s
Soundness / License headers check	5s
Soundness / Python lint check	4s
Soundness / Shell check	36s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	3s
Unit tests / Unit tests / Linux (6.0)	1m 15s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 27s
Unit tests / Unit tests / Linux (nightly-main)	1m 11s
Cxx interop / Cxx interop / Linux (6.0)	1m 11s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 26s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 42s
	13m 44s

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