refactor(kit): drop async pipe and let directive

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[lumberjack-bot]

Tests completed successfully ✅

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BundleMon

Files updated (1)

Status	Path	Size	Limits
✅	demo/browser/main.(hash).js	294.83KB (-46B -0.02%)	+10%

Unchanged files (4)

Status	Path	Size	Limits
✅	demo/browser/vendor.(hash).js	250.11KB	+10%
✅	demo/browser/runtime.(hash).js	43.07KB	+10%
✅	demo/browser/styles.(hash).css	16.27KB	+10%
✅	demo/browser/polyfills.(hash).js	11.18KB	+10%

Total files change -46B -0.01%

Groups updated (1)

Status	Path	Size	Limits
✅	demo/browser/*..js	7.1MB (-46B 0%)	-

Final result: ✅

View report in BundleMon website ➡️

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