chore: [PIPE-18794]: optimise the ExpressionInput component

[PratyushGar]

Changes and their impact:

1. Moving JSX of Popover Second Child to JSX Block:
   Earlier the JSX for the dropdown was being created and rendered every time the renderer function was called, moving this into a separate JSX block () will now render when needed ( popover opened) to avoid creation and rendering of the dropdown when the popover is closed
2. Using useMemo for filteredItems:
   For large items array, the react state is recalculated every time the queryValue or items prop is changed, moving them to useMemo ensures that the filtering operation is only performed when necessary.

JIRA: PIPE-19058

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