perf: remove intermediate activities after stream ends #3291

Job	Run time
Build	5m 0s
Verify build-browser (ubuntu-latest)	54s
Build samples	32s
Print commit stats	58s
Verify build-browser (windows-latest)	2m 10s
Verify build-browser (macos-26)	1m 6s
Static code analysis	3m 54s
Unit test	3m 28s
Type definitions test	2m 2s
HTML test (1/17)	7m 1s
HTML test (5/17)	7m 49s
HTML test (10/17)	7m 26s
HTML test (2/17)	7m 26s
HTML test (6/17)	7m 35s
HTML test (14/17)	7m 48s
HTML test (9/17)	8m 32s
HTML test (8/17)	7m 18s
HTML test (11/17)	7m 42s
HTML test (7/17)	7m 20s
HTML test (4/17)	7m 13s
HTML test (13/17)	7m 24s
HTML test (16/17)	7m 37s
HTML test (15/17)	7m 27s
HTML test (3/17)	7m 30s
HTML test (17/17)	7m 20s
HTML test (12/17)	7m 37s
Merge test snapshots	4s
Merge test results	35s
	2h 28m 48s

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