feat: make entity select searchable in events browser

[epuluikis]

• Added search to the entity select on the events browser page.
• Since select values can't be searched as they're elements, I added a search array to entitiesSelectOptions.
• Used a ref to fix an issue where the input wouldn't blur when an already selected option was picked again.
• Added CSS adjustment to fix opacity issues where child components were overriding the parent text color.

Ref #1147