Add search input to manual record trigger object select (#21777)

When configuring a manual record trigger in the workflow editor, the
object selector could only be scrolled, not searched. This adds a search
input to the object `Select` (via the existing `withSearchInput` prop),
matching the behavior already used in the create-record action's object
selector.

## Before

<img width="786" height="544" alt="CleanShot 2026-06-18 at 13 35 45@2x"
src="https://github.com/user-attachments/assets/30426a16-927e-4be3-80b6-73a296253c16"
/>

## After
<img width="786" height="628" alt="CleanShot 2026-06-18 at 13 35 22@2x"
src="https://github.com/user-attachments/assets/57455518-0f95-483b-81d4-e1f4547c0d30"
/>

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packages/twenty-front/src/modules/workflow/workflow-trigger/components/WorkflowEditTriggerManual.tsx

@@ -146,6 +146,7 @@ export const WorkflowEditTriggerManual = ({
             }}
             dropdownOffset={{ y: 4 }}
             dropdownWidth={GenericDropdownContentWidth.ExtraLarge}
+            withSearchInput
           />
         ) : null}