perf: remove intermediate activities after stream ends #3295

Job	Run time
Build samples	26s
Print commit stats	1m 7s
Build	5m 1s
Verify build-browser (windows-latest)	2m 15s
Verify build-browser (ubuntu-latest)	50s
Verify build-browser (macos-26)	48s
Type definitions test	2m 5s
Static code analysis	3m 58s
Unit test	3m 7s
HTML test (2/17)	7m 34s
HTML test (12/17)	7m 23s
HTML test (8/17)	7m 8s
HTML test (11/17)	7m 33s
HTML test (14/17)	7m 38s
HTML test (10/17)	8m 14s
HTML test (1/17)	7m 14s
HTML test (6/17)	7m 50s
HTML test (3/17)	7m 22s
HTML test (7/17)	7m 12s
HTML test (9/17)	8m 2s
HTML test (5/17)	7m 51s
HTML test (17/17)	7m 17s
HTML test (13/17)	7m 43s
HTML test (16/17)	7m 31s
HTML test (15/17)	7m 27s
HTML test (4/17)	7m 41s
Merge test results	29s
Merge test snapshots	6s
	2h 28m 52s

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