Find and replace feature followup regarding checkboxview and used icons.

[mateuszzagorski]

📝 Provide a description of the improvement

Followup from #9959.

Right now there is no easy way for users to style checkboxes. For example, changing checkbox behavior on :checked pseudo-class or altering colors for it would require a lot of additional effort. Checkboxview class should be updated in a way that will allow changes like that without the need to alter the code too much.

Additionally, icons used in the find-and-replace feature are not compatible with icons used for pagination. This should be reviewed and updated to keep everything consistent. 

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[oleq]

This will no longer be a problem because of #10229.