Delay writing metadata file (no UX impact) #5029

Job	Run time
perf	32m 7s
benchcomp-tests	5m 17s
regression (macos-11)	34m 21s
regression (ubuntu-20.04)	35m 55s
regression (ubuntu-22.04)	27m 28s
write-json-symtab-regression	26m 29s
bookrunner	27m 28s
releasebundle-macos (macos-11)	9m 3s
releasebundle-ubuntu	29m 32s
	3h 47m 40s

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