Feature Request: Add auto complete to che Editor Definition text field

[mikoto2000]

Is your enhancement related to a problem? Please describe

Users who use a custom editor definition are likely to use the same definition in the future.
However, at the moment, they have to enter the Editor Definition every time they open the dashboard.

Describe the solution you'd like

I would like to add auto-complete to the Editor Definition text field (the text field highlighted in yellow in the screenshot below).

Describe alternatives you've considered

No response

Additional context

No response

[mikoto2000]

This modification will probably enable auto-complete, but I was unable to start the dashboard and therefore could not verify its operation, so I was unable to create a pull request.

eclipse-che/che-dashboard@0968436

[che-bot]

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Moderators: Add lifecycle/frozen label to avoid stale mode.