feat(webapp,run-engine): mollifier drainer replay + stale sweep + cancelled-run engine API #6720

Job	Run time
Detect changes	4s
e2e-webapp / 🧪 E2E Tests: Webapp	3m 24s
typecheck / typecheck	6m 57s
packages / 🧪 Unit Tests: Packages (1, 1)	11m 36s
internal / 🧪 Unit Tests: Internal (4, 8)	5m 56s
internal / 🧪 Unit Tests: Internal (2, 8)	13m 18s
webapp / 🧪 Unit Tests: Webapp (2, 8)	4m 52s
internal / 🧪 Unit Tests: Internal (3, 8)	9m 8s
internal / 🧪 Unit Tests: Internal (6, 8)	5m 21s
webapp / 🧪 Unit Tests: Webapp (1, 8)	6m 37s
internal / 🧪 Unit Tests: Internal (1, 8)	6m 16s
webapp / 🧪 Unit Tests: Webapp (7, 8)	8m 55s
webapp / 🧪 Unit Tests: Webapp (4, 8)	8m 16s
internal / 🧪 Unit Tests: Internal (7, 8)	6m 6s
internal / 🧪 Unit Tests: Internal (8, 8)	5m 17s
webapp / 🧪 Unit Tests: Webapp (5, 8)	5m 47s
webapp / 🧪 Unit Tests: Webapp (6, 8)	8m 27s
webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 31s
internal / 🧪 Unit Tests: Internal (5, 8)	6m 59s
webapp / 🧪 Unit Tests: Webapp (8, 8)	3m 24s
sdk-compat	0s
e2e	0s
webapp / 📊 Merge Reports	51s
packages / 📊 Merge Reports	26s
internal / 📊 Merge Reports	24s
All PR Checks	3s
	2h 11m 55s

Provide feedback