Button: Replace deprecated isSmall property with size="small" property
Related to #53472
The deprecated isSmall property is being used in the Button component and in the component that wraps the Button component.
I believe that the isSmall property should be replaced with size="prop" to officially deprecate it, as mentioned in this comment.
Note isSmall is used in several other places and there's a PR to fix it at https://github.com/WordPress/gutenberg/pull/53599
I can see there are more instances still. So reopening
I'm taking on this one.
For future contributors, the remaining components to replace that I found:
- [ ]
SidesDropdown - [ ]
PaletteEdit - [ ]
ToolsPanelHeader
Once #59302 is merged, all isSmall props will be replaced and this issue can be closed. Thank you to everyone who worked on this issue!