Since brush assets were merged, all sculpt and paint modes have a unified
"Brush" tool that is used for all brushes. Based on feedback, this mixes brush
types a bit too much, so some specific tools that use brushes should be brought
back. These brush types just behave very different from the main brush types,
and users expect them to be easily accessible from the toolbar. This also makes
them more discoverable and having tools that remember their last used brush can
be useful too (e.g. assigning shortcut to eraser tool to switch back to last
used eraser, rather than a specific eraser brush).
Note that further changes are planned, to get a true "best of both worlds"
design, where people can use a global brush library without having to worry
about tools, but brushes can also be accessed via tool categorization.
The new design works well with both mental models without being a compromise
in-between.
a79f9100a6 already brought back some tool for grease pencil draw mode, with this
commit the design is now applied to all sculpt & paint modes.
See PR for a list of tools that were brought back.
Design Task: https://projects.blender.org/blender/blender/issues/128066
Pull Request: https://projects.blender.org/blender/blender/pulls/128038
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