Fix SENTRY_TRACES_BACKGROUND_SAMPLE_RATE not respected #6788

Job	Run time
compute-version	3s
build-docs / build-docs	1m 28s
build-artifacts / gateway-build	11s
build-artifacts / code-lint	49s
build-artifacts / runner-test (macos-latest)	59s
build-artifacts / frontend-build	11s
build-artifacts / runner-test (ubuntu-latest)	1m 1s
build-artifacts / generate-json-schema	19s
build-artifacts / python-build	25s
build-artifacts / python-test (ubuntu-latest, 3.9)	9m 55s
build-artifacts / python-test (macos-latest, 3.13)	2m 56s
build-artifacts / python-test (macos-latest, 3.12)	3m 48s
build-artifacts / python-test (macos-latest, 3.11)	2m 56s
build-artifacts / python-test (windows-latest, 3.10)	2m 32s
build-artifacts / python-test (ubuntu-latest, 3.13)	9m 32s
build-artifacts / python-test (ubuntu-latest, 3.12)	10m 24s
build-artifacts / python-test (windows-latest, 3.13)	2m 22s
build-artifacts / python-test (macos-latest, 3.10)	4m 31s
build-artifacts / python-test (ubuntu-latest, 3.10)	10m 35s
build-artifacts / python-test (ubuntu-latest, 3.11)	8m 38s
build-artifacts / python-test (windows-latest, 3.9)	3m 26s
build-artifacts / python-test (macos-latest, 3.9)	4m 4s
build-artifacts / python-test (windows-latest, 3.12)	2m 57s
build-artifacts / python-test (windows-latest, 3.11)	2m 33s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	29s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	37s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	20s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	16s
	1h 28m 17s

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