[mlir][spirv] Use assemblyFormat to define atomic op assembly (#76323)

see #73359

Declarative assemblyFormat ODS is more concise and requires less
boilerplate than filling out CPP interfaces.

Changes:
* updates the Ops defined in `SPIRVAtomicOps.td` to use assemblyFormat.
* Removes print/parse from`AtomcOps.cpp` which is now generated by
assemblyFormat
* Adds `Trait` to verify that a pointer operand `foo`'s pointee type
matches operand `bar`'s type
* * Updates error message expected in tests from new Trait
* Updates tests to updated format (largely using <operand> in place of
"operand")