feat(webapp): enforce watch plan limits #10135

Job	Run time
Detect changes	7s
code-quality / code-quality	2m 25s
e2e-webapp / 🧪 E2E Tests: Webapp	5m 28s
typecheck / typecheck	1m 36s
internal / 🧪 Unit Tests: Internal	7m 26s
runops-guard / runops-guard	1m 30s
obsmap / 🧪 Unit Tests: Observability Map	1m 24s
webapp / 🧪 Unit Tests: Webapp (1, 12)	7m 52s
webapp / 🧪 Unit Tests: Webapp (9, 12)	1h 4m 25s
webapp / 🧪 Unit Tests: Webapp (6, 12)	7m 25s
sdk-compat	0s
webapp / 🧪 Unit Tests: Webapp (3, 12)	8m 5s
webapp / 🧪 Unit Tests: Webapp (5, 12)	7m 15s
webapp / 🧪 Unit Tests: Webapp (8, 12)	9m 47s
webapp / 🧪 Unit Tests: Webapp (10, 12)	7m 7s
webapp / 🧪 Unit Tests: Webapp (2, 12)	8m 55s
webapp / 🧪 Unit Tests: Webapp (7, 12)	7m 44s
webapp / 🧪 Unit Tests: Webapp (4, 12)	7m 10s
webapp / 🧪 Unit Tests: Webapp (12, 12)	7m 44s
e2e	0s
webapp / 🧪 Unit Tests: Webapp (11, 12)	7m 37s
packages	0s
webapp / 📊 Merge Reports	20s
All PR Checks	5s
	2h 51m 27s

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