fix: external traces now respect parent sampling, and prevent broken traces when there is no external trace context #3313

Job	Run time
typecheck / typecheck	1m 5s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	54s
units / packages / 🧪 Unit Tests: Packages (1, 1)	1m 6s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 5s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	1m 4s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	54s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 2s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	1m 4s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	1m 6s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	1m 6s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	1m 6s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	1m 6s
units / internal / 🧪 Unit Tests: Internal (3, 8)	1m 6s
units / internal / 🧪 Unit Tests: Internal (4, 8)	1m 5s
units / internal / 🧪 Unit Tests: Internal (2, 8)	1m 5s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	1m 6s
units / internal / 🧪 Unit Tests: Internal (1, 8)	1m 5s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	1m 6s
units / internal / 🧪 Unit Tests: Internal (5, 8)	1m 5s
units / internal / 🧪 Unit Tests: Internal (6, 8)	1m 6s
units / internal / 🧪 Unit Tests: Internal (8, 8)	1m 5s
units / internal / 🧪 Unit Tests: Internal (7, 8)	1m 5s
units / packages / 📊 Merge Reports	1s
units / internal / 📊 Merge Reports	1s
units / webapp / 📊 Merge Reports	1s
	23m 35s

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