feat(webapp,run-engine): mollifier drainer replay + stale sweep + cancelled-run engine API #6612

Job	Run time
Detect changes	3s
webapp / 🧪 Unit Tests: Webapp (4, 8)	8m 11s
typecheck / typecheck	7m 7s
webapp / 🧪 Unit Tests: Webapp (2, 8)	4m 50s
internal / 🧪 Unit Tests: Internal (6, 8)	5m 16s
webapp / 🧪 Unit Tests: Webapp (1, 8)	6m 48s
webapp / 🧪 Unit Tests: Webapp (8, 8)	3m 25s
internal / 🧪 Unit Tests: Internal (1, 8)	6m 57s
webapp / 🧪 Unit Tests: Webapp (6, 8)	7m 34s
webapp / 🧪 Unit Tests: Webapp (7, 8)	8m 10s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 29s
internal / 🧪 Unit Tests: Internal (3, 8)	9m 16s
internal / 🧪 Unit Tests: Internal (8, 8)	5m 36s
internal / 🧪 Unit Tests: Internal (7, 8)	6m 4s
webapp / 🧪 Unit Tests: Webapp (5, 8)	4m 58s
internal / 🧪 Unit Tests: Internal (5, 8)	6m 50s
e2e	0s
internal / 🧪 Unit Tests: Internal (2, 8)	12m 50s
internal / 🧪 Unit Tests: Internal (4, 8)	5m 45s
webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 49s
sdk-compat	0s
packages	0s
webapp / 📊 Merge Reports	52s
internal / 📊 Merge Reports	27s
All PR Checks	3s
	1h 58m 20s

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