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search: add a/b feature flag for lucky search

Administrator requested to merge rvt/lucky-search-ab-flag-2 into main

Created by: rvantonder

Stacked on https://github.com/sourcegraph/sourcegraph/pull/39920.

Only need a A/B testing flag in the backend--the client behavior and event logging is entirely dependent on backend result response. A/B users will just "get" lucky search in the currently default standard query mode (no separate lucky search toggles or such, it would be as if they turned on defaultPatternType == lucky but without actually setting that value).

I will document the Q/A and duration for A/B test in a short doc separately, before rolling out the change.

Test plan

No test needed, just a feature flag addition.

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