Removes the SourceClear workflow that contains a dangerous curl|bash pattern,
which presents risks of script injection and untrusted remote code execution
in the CI/CD pipeline. This follows the same remediation approach used in the
PHP SDK (optimizely/php-sdk#294).

Co-authored-by: Claude Sonnet 4.5 <[email protected]>

## Summary

Adds Feature Rollout support to the JavaScript SDK. Feature Rollouts are a new experiment rule type that combines Targeted Delivery simplicity with A/B test measurement capabilities. During project config parsing, the "everyone else" variation from the flag's rollout is injected into any experiment with type "feature_rollout", enabling correct evaluation without changes to decision logic.

## Changes

- Added optional `type` string field to the Experiment interface
- Added config parsing logic to inject the "everyone else" rollout variation into feature_rollout experiments
- Added traffic allocation entry (endOfRange=10000) for the injected variation
- Added `getEveryoneElseVariation` helper function to extract the last rollout rule's first variation
- Updated variation lookup maps (variationKeyMap, variationIdMap, variationVariableUsageMap) with injected variation
- Added 6 unit tests covering feature rollout injection, edge cases, and backward compatibility

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Co-authored-by: Raju Ahmed <[email protected]>