fix helperpane search fields are not focusable

[senithkay]

Purpose

The search fields inside the Helper Pane were not focusable, preventing users from typing or interacting with them.
This issue was caused by unnecessary event.preventDefault() and event.stopPropagation() calls, which blocked normal focus and click behavior within the pane.

Resolves: wso2/product-ballerina-integrator#1975

Goals

• Allow search fields inside the Helper Pane to be properly focused and usable.
• Restore expected click and focus behavior for interactive elements within the pane.
• Remove outdated event handling logic that is no longer needed with the latest CodeMirror updates.

Approach

• Removed the unnecessary event.preventDefault() and event.stopPropagation() calls applied to Helper Pane interactions.
• These handlers were originally added for older expression editor behavior but now interfere with focus logic.
• With the handlers removed, search fields and other clickable elements behave correctly without side effects.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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