fix: increase background build test timeouts to reduce flakiness

[mishushakov]

Summary

• Increased buildInBackground test timeouts from 10s to 30s across JS SDK, Python async, and Python sync tests
• The 10s timeout was too tight for the 2+ API roundtrips (requestBuild + triggerBuild) that run before returning, causing frequent CI timeouts especially in Production environments
• These tests were the most common source of flaky failures in sdk_tests.yml over the past week

Test plan

• Verify background build tests pass on CI (both Staging and Production, ubuntu and windows)
• Confirm no more timeout-related failures in subsequent runs

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Latest commit: cd65c0c

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[cursor]

PR Summary

Low Risk
Only adjusts SDK test timeouts/markers; no production code changes, with the main risk being longer CI hangs if a build truly stalls.

Overview
Background buildInBackground tests are made less flaky by allowing substantially more time for the build to start.

In the JS SDK, the Vitest timeout for backgroundBuild.test.ts is increased from 10_000 to 180_000. In the Python SDK (sync and async), the @pytest.mark.timeout(10) decorators are removed from the equivalent background build tests.

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[github-actions]

Package Artifacts

Built from c09c483. Download artifacts from this workflow run.

JS SDK (e2b@2.19.1-mishushakov-flaky-test-analysis.0):

npm install ./e2b-2.19.1-mishushakov-flaky-test-analysis.0.tgz

CLI (@e2b/cli@2.9.1-mishushakov-flaky-test-analysis.0):

npm install ./e2b-cli-2.9.1-mishushakov-flaky-test-analysis.0.tgz

Python SDK (e2b==2.20.0+mishushakov-flaky-test-analysis):

pip install ./e2b-2.20.0+mishushakov.flaky.test.analysis-py3-none-any.whl

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