feat(webapp,run-engine): mollifier drainer replay + stale sweep + cancelled-run engine API #6433

Job	Run time
Detect changes	6s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 36s
typecheck / typecheck	7m 14s
internal / 🧪 Unit Tests: Internal (4, 8)	6m 27s
internal / 🧪 Unit Tests: Internal (3, 8)	9m 23s
webapp / 🧪 Unit Tests: Webapp (1, 8)	3m 57s
internal / 🧪 Unit Tests: Internal (1, 8)	6m 45s
webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 57s
webapp / 🧪 Unit Tests: Webapp (4, 8)	3m 56s
internal / 🧪 Unit Tests: Internal (5, 8)	7m 17s
internal / 🧪 Unit Tests: Internal (8, 8)	5m 38s
webapp / 🧪 Unit Tests: Webapp (6, 8)	3m 57s
internal / 🧪 Unit Tests: Internal (6, 8)	5m 18s
webapp / 🧪 Unit Tests: Webapp (7, 8)	3m 57s
internal / 🧪 Unit Tests: Internal (2, 8)	12m 50s
webapp / 🧪 Unit Tests: Webapp (8, 8)	3m 57s
webapp / 🧪 Unit Tests: Webapp (2, 8)	3m 40s
webapp / 🧪 Unit Tests: Webapp (5, 8)	3m 56s
internal / 🧪 Unit Tests: Internal (7, 8)	6m 16s
sdk-compat	0s
e2e	0s
packages	0s
webapp / 📊 Merge Reports	24s
internal / 📊 Merge Reports	26s
All PR Checks	3s
	1h 43m 0s

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