fix(dashboard): Fix autosuggest UI issues

[desiprisg]

What changed? Why was the change needed?

Use the autocomplete extension and only offer suggestion after {{. No HTML and no liquid operator suggestions.

Screenshots

https://github.com/user-attachments/assets/84d78cbf-bb43-4e08-9dc1-72d2683413c0

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### Related enterprise PR ### Special notes for your reviewer

[linear[bot]]

NV-4789 🐛 Fix autosuggest UI issues

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commit: d2576eb