[GlobalOpt][Flow][Quant] Fix segfault on unlowered `quant.uniform` types (#24824)

`HoistIntoGlobalsPass`'s `HoistableTensorTypeInterface` unconditionally
called `getIntOrFloatBitWidth()` on a tensor's element type to decide
whether it is hoistable, assuming it is always a plain int/float. A
`!quant.uniform<...>` element type is neither, so
`getIntOrFloatBitWidth()` crashes instead of returning a sane answer.

`isHoistableType`/`isHoistableLeafType`, with this PR, check that the
element type is actually an int/float
before computing its bit width via a new helper `hasComputableBitWidth`,
and conservatively treat anything else as
non-hoistable.

Additonally, `quant.uniform` types leak into the pipeline because
`quant` is a transitive type dependency of TOSA, not because we have any
lowering support for `quant.qcast`/`quant.dcast`/`quant.scast` AFAIK.
TOSA's own conversion to `linalg`/`arith` is expected to fully resolve
these before `Flow`. `VerifyInputLegalityPass` already enforces that for
those some dialects, `quant` was simply missing from the list, so IR
where these ops survive past `GlobalOptimization` would segfault later.

Fixes #24814

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Signed-off-by: Federico Bruzzone <federico.bruzzone.i@gmail.com>