fix: external traces now respect parent sampling, and prevent broken traces when there is no external trace context #3315

Job	Run time
typecheck / typecheck	6m 19s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 30s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	5m 22s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	5m 13s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 23s
units / packages / 🧪 Unit Tests: Packages (1, 1)	3m 38s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	5m 36s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	2m 56s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	2m 45s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	3m 15s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	5m 45s
units / internal / 🧪 Unit Tests: Internal (3, 8)	3m 34s
units / internal / 🧪 Unit Tests: Internal (6, 8)	4m 40s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	6m 47s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	5m 29s
units / internal / 🧪 Unit Tests: Internal (8, 8)	2m 5s
units / internal / 🧪 Unit Tests: Internal (4, 8)	4m 59s
units / internal / 🧪 Unit Tests: Internal (1, 8)	5m 49s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	2m 13s
units / internal / 🧪 Unit Tests: Internal (5, 8)	3m 59s
units / internal / 🧪 Unit Tests: Internal (7, 8)	2m 29s
units / internal / 🧪 Unit Tests: Internal (2, 8)	4m 34s
units / packages / 📊 Merge Reports	22s
units / internal / 📊 Merge Reports	20s
units / webapp / 📊 Merge Reports	58s
	1h 34m 0s

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