[mlir] Start migrating more dialects to prefixed form

Marked all dialects that could be (reasonably) easily flipped to _Both
prefix. Updating the accessors to prefixed form will happen in follow
up, this was to flush out conflicts and to mark all dialects explicitly
as I plan to flip OpBase default to _Prefixed to avoid needing to
migrate new dialects.

Except for Standalone example which got flipped to _Prefixed.

Differential Revision: https://reviews.llvm.org/D128027