Introduce a temporary flag to enable ScopedTypeaheadSearch $wgWBRepoSettings['tmpEnableScopedTypeaheadSearch'].
When this flag, and $wgWBRepoSettings['enableEntitySearchUI'] are both enabled, show a placeholder for ScopedTypeaheadSearch. The goal is to add a flag, validate that is has an impact when enabled, and changes nothing when it is not.
Acceptance Criteria
- When this flag is set in a development environment, the entity search is replaced by text "SEARCH WILL GO HERE"
- When this flag is not set, everything continues to work as before