[Feature]: SwatchColorPicker should support overriding just the cell content in Fluent React v8

[pKalaga]

Library

React / v8 (@fluentui/react)

Describe the feature that you would like added

SwatchColorPicker currently allows overriding the entire buttonCell, which results in the button losing all the default handlers and functionality. The Picker should also allow overriding the content svg which uses fill property and cannot include complex colors like gradients or other color attributes.

Proposal is to add a onRenderCellContent to SwatchColorPickerProps which just overrides the default svg to show cell content.

Have you discussed this feature with our team

No response

Additional context

No response

Validations

• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.