Fix ATTR_ENUMERATED_COERCION for contenteditable

What does this MR do and why?

This MR fixes ATTR_ENUMERATED_COERCION

As a part of Vue 3 migration ATTR_ENUMERATED_COERCION is deprecated

It is important to replace attribute to v-bind syntax

This file has correct implementation, only tests added

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1. Check out branch
2. Check files
3. Run newly added tests

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Related to #428638 (closed)