feat(webapp,run-engine): mollifier drainer replay + stale sweep + cancelled-run engine API #6577

Job	Run time
Detect changes	6s
typecheck / typecheck	7m 10s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 31s
internal / 🧪 Unit Tests: Internal (3, 8)	9m 14s
internal / 🧪 Unit Tests: Internal (1, 8)	6m 30s
internal / 🧪 Unit Tests: Internal (6, 8)	6m 11s
webapp / 🧪 Unit Tests: Webapp (1, 8)	6m 31s
internal / 🧪 Unit Tests: Internal (5, 8)	6m 58s
internal / 🧪 Unit Tests: Internal (4, 8)	6m 21s
webapp / 🧪 Unit Tests: Webapp (4, 8)	12m 30s
webapp / 🧪 Unit Tests: Webapp (6, 8)	8m 4s
webapp / 🧪 Unit Tests: Webapp (5, 8)	4m 44s
internal / 🧪 Unit Tests: Internal (2, 8)	13m 31s
webapp / 🧪 Unit Tests: Webapp (8, 8)	3m 12s
internal / 🧪 Unit Tests: Internal (8, 8)	5m 49s
webapp / 🧪 Unit Tests: Webapp (7, 8)	8m 45s
internal / 🧪 Unit Tests: Internal (7, 8)	6m 11s
webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 33s
webapp / 🧪 Unit Tests: Webapp (2, 8)	4m 34s
packages	0s
sdk-compat	0s
e2e	0s
webapp / 📊 Merge Reports	47s
internal / 📊 Merge Reports	24s
All PR Checks	2s
	2h 4m 38s

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