Remove more obsolete datetime types (#5552) #2334

Job	Run time
Check Credentials for jobs that need JSON credentials	1s
WASM Demo	2m 3s
bench-binsize	2m 35s
bench-memory (macos-latest)	5m 20s
bench-memory (ubuntu-latest)	3m 50s
bench-memory (windows-latest)	10m 29s
bench-perf (components/collections)	4m 37s
bench-perf (components/datetime)	1m 30s
bench-perf (components/locale)	2m 40s
bench-perf (components/locale_core)	5m 20s
bench-perf (components/segmenter)	3m 45s
bench-perf (components/plurals)	6m 11s
bench-perf (provider/blob)	3m 15s
bench-perf (utils/fixed_decimal)	6m 9s
bench-perf (utils/litemap)	2m 7s
bench-perf (utils/tinystr)	6m 36s
bench-perf (utils/writeable)	3m 40s
bench-perf (utils/zerotrie)	5m 48s
bench-perf (utils/zerovec)	8m 34s
C++ docs	37s
Dart docs	1m 20s
Rust docs	5m 48s
TypeScript docs	46s
Deploy to GitHub Pages	7m 33s
	1h 40m 34s

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