fix: preserve LaunchDarkly boolean defaults

[Sanjays2402]

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Changes

Closes #8047

Boolean LaunchDarkly imports now derive the environment default from the served fallthrough or off variation instead of the separate on/off toggle. Unsupported rollout or non-boolean values retain the existing toggle fallback.

How did you test this code?

Added focused tests for on-but-serving-false and off-but-serving-true configurations. The focused pytest cases, Ruff, formatting, Mypy, and both outgoing diff gates pass.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 0daee9de-1a6e-46e1-8298-a7cc524f3ebb

📥 Commits

Reviewing files that changed from the base of the PR and between 5785e8c and 47f5e05.

📒 Files selected for processing (2)

• api/integrations/launch_darkly/services.py
• api/tests/unit/integrations/launch_darkly/test_services.py

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📝 Walkthrough

Walkthrough

Boolean LaunchDarkly feature-state imports now derive enabled from the selected boolean variation: fallthrough.variation when the flag is on, or offVariation when it is off. The resulting value is persisted in FeatureState defaults. A parametrised unit test covers both configuration paths using mocked persistence and related side effects.

Estimated code review effort: 2 (Simple) | ~10 minutes

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