A single preferred way for event methods prefix

In React config there is set up for two rules `jsx-handler-names` and `sort-comp`. First one is turned off and has default options assigned. First one suggests using `handle` prefix and the second one we have `on` prefix for event handlers (if I am not wrong).

I think there should be a single approach for this and as react documentation suggests maybe `handle` is better one.

Inspect the React config entries for jsx-handler-names and sort-comp, then review the relevant ESLint rule documentation and the style guide's event-handler naming guidance. Decide which prefix the project should standardize on and update the configuration and guidance so they no longer conflict; done when one convention is consistently documented and enforced.

Written by the indexing model from the issue text.