refactor(amazonq): move debounce to top level.

[Hweinstock]

Problem

Adding logging statements to the top level is extremely noisy, since that part still triggers on each key stroke. This could also improve latency since any computation at the top-level will be redone on each keystroke.

Solution

• move the debounce up a layer.
• remove outdated tests, since the debounce util already has tests for all this logic.
• added new tests for new behavior.

Verification

• I tested this side-by-side with previous version and didn't notice a difference.

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