[mlir][vector] Linearization: push 'bit width' logic out of patterns (#136581)

[NFC]
Vector linearization is a collection of rewrite patterns that reduce the
rank of vector operands and results.

In https://github.com/llvm/llvm-project/pull/83314 an option to ignore
(make 'legal') operations with large inner-most dimensions was added.
This current PR is a step towards making that option live outside of
upstream MLIR. The motivation is to remove non-core functionality (I
would like to use this pass, but would prefer not to deal with
'targetVectorBitWidth` at all).

As a follow-up to this PR, I propose that user(s) of the
`targetVectorBitWidth` move the relevant code (now in
mlir/test/lib/Dialect/Vector/TestVectorTransforms.cpp) to their code
bases, and then eventually remove it from upstream. In addition the tests need to
split out (I've intentionally not modified the lit tests here, to make
it easier to confirm that this is a NFC). I'm happy to help make it
easier to do this final step!

The approach I've used is to move the logic pertaining to
`targetVectorBitWidth` out the patterns, and into the conversion target,
which the end user can control outside of core MLIR.

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