[ui] GraphEditor: Address Key Event Conflicts in Node Menu

[waaake]

Description

This PR addresses the Key Handling issue in the Node Creation Menu within the GraphEditor.
The changes ensure that the Enter and Return key events are correctly captured and handled by the Item first and then forwarded to the specified Item i.e. SearchBar.textField.

Details

• Fixed the issue with Node creation Menu by setting the Keys.priority property to be Keys.AfterItem.
  Quoting from https://doc.qt.io/qt-6/qml-qtquick-keys.html

Default priority ordering is Keys.BeforeItem and has the key event processing as:
1. Items specified in forwardTo
2. Specific key handlers, e.g. onReturnPressed, onPressed, onReleased handlers
3. Item specific key handling (Key handling of the parent item)

Keys.AfterItem has the key event processing as:
1. Item specific key handling (Key handling of the parent item)
2.  Items specified in forwardTo
3. Specific key handlers, e.g. onReturnPressed, onPressed, onReleased handlers

Thus, Keys.AfterItem as the priority ensures the Item's own key events are handled before Forwarding it to specified items. This handles all defined Enter and Return key presses and is more suitable for our use-case here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.90%. Comparing base (6e99f9d) to head (b31da19).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2622   +/-   ##
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  Coverage    69.90%   69.90%           
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  Files          121      121           
  Lines         7078     7078           
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  Hits          4948     4948           
  Misses        2130     2130           

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