Feature Request: Allow Icons to be replaced in contentOnly mode

[bacoords]

When a template is in contentOnly mode, some media types (like images) can still be swapped out by the end user. I wonder if it would make sense for the Icon Block to offer the same functionality.

References:

• useBlockEditingMode - https://developer.wordpress.org/block-editor/reference-guides/packages/packages-block-editor/#useblockeditingmode