chore: converted querysearch codemirror component to uncontrolled component

[ahrefabhi]

Refactor: Convert QuerySearch CodeMirror Component to Uncontrolled

📄 Summary

This PR refactors the QuerySearch component to use an uncontrolled CodeMirror editor pattern, eliminating local query state management and fixing cursor jumping issues that occurred when the component was controlled.

✅ Changes

Refactoring

• Removed local query state: Eliminated redundant local state tracking of the query value
• Uncontrolled CodeMirror: CodeMirror now manages its own internal state via the editor ref instead of being controlled by React state

[srikanthccv]

Examples where it breaks with other behaviour changes

• add a filter in list view page of traces service.name = 'frontend' and then switch to time series view
• use the "Share" button we show on the top right of the page and use "Copy page link" to get the sharable URL and open that URL.

They should be caught is dev testing and we should write tests to ensure such problems are caught if we don't have tests already for them.

[ahrefabhi]

Examples where it breaks with other behaviour changes

• add a filter in list view page of traces service.name = 'frontend' and then switch to time series view
• use the "Share" button we show on the top right of the page and use "Copy page link" to get the sharable URL and open that URL.

They should be caught is dev testing and we should write tests to ensure such problems are caught if we don't have tests already for them.

The above issues are fixed, added tests as well