Refactor `print_namespace_{start,stop}.` (#1380) #2695

Job	Run time
{ "os": "ubuntu-20.04" }	3m 29s
{ "flag_warnings": "ON", "glibc_asserts": "ON", "os": "ubuntu-22.04" }	3m 44s
{ "os": "macos-12" }	4m 37s
{ "os": "macos-13" }	5m 36s
{ "os": "windows-latest" }	12m 14s
{ "os": "ubuntu-22.04", "sanitizer": "address-leak" }	4m 48s
{ "os": "ubuntu-22.04", "enable_usecases": "On", "update_references": "On" }	5m 57s
{ "flag_warnings": "ON", "os": "ubuntu-22.04", "sanitizer": "undefined" }	4m 2s
commit-references	6s
	44m 33s

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