[DispatchCreation] Add an option to block matmul producers from being fused in the same dispatch region (#24899)

When targeting CPU with data tiling and ukernels enabled (`mmt4d`
specifically), some producers materialize on the stack when fused
together with the consuming matmuls, which may lead to stack oveflow.

This PR adds a workaround/flag which would block fusion of such ops.

The flag is on by default, no performance regressions observed.

### Alternatives considered

At the level of dispatch creation it is not possible to precisely
calculate whether the producer would overflow the stack or not since
there is not enough information at that point. It is possible to
implement a crude approximation, but it heavily depends on the exact
tiling and vectorizing details lower on the stack.

Assisted-by: Claude Code
Signed-off-by: Alex Denisov <denisov@roofline.ai>

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Signed-off-by: Alex Denisov <denisov@roofline.ai>