fix(webapp): eliminate SSE abort-signal memory leak (#3430) #3020

Job	Run time
typecheck / typecheck	6m 20s
units / packages / 🧪 Unit Tests: Packages (1, 1)	8m 57s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	4m 33s
units / internal / 🧪 Unit Tests: Internal (3, 8)	8m 48s
units / internal / 🧪 Unit Tests: Internal (2, 8)	12m 25s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	4m 13s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	8m 3s
units / internal / 🧪 Unit Tests: Internal (1, 8)	7m 11s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	6m 40s
units / internal / 🧪 Unit Tests: Internal (8, 8)	2m 36s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	6m 4s
units / internal / 🧪 Unit Tests: Internal (4, 8)	6m 19s
units / internal / 🧪 Unit Tests: Internal (5, 8)	6m 27s
units / internal / 🧪 Unit Tests: Internal (6, 8)	6m 36s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	3m 15s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	3m 4s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	5m 55s
units / internal / 🧪 Unit Tests: Internal (7, 8)	5m 36s
publish-webapp / publish	7m 12s
publish-worker-v4 / build (supervisor)	3m 34s
publish-worker / build (coordinator)	2m 8s
publish-worker / build (kubernetes-provider)	1m 28s
publish-worker / build (docker-provider)	1m 28s
units / webapp / 📊 Merge Reports	47s
units / packages / 📊 Merge Reports	28s
units / internal / 📊 Merge Reports	25s
	2h 10m 32s

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