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218f0701 - [mlir][vector] Update tests for collapse 4/n (nfc) (#96214)

[mlir][vector] Update tests for collapse 4/n (nfc) (#96214) The main goal of this PR (and subsequent PRs), is to add more tests with scalable vectors to: * vector-transfer-collapse-inner-most-dims.mlir There's quite a few cases to consider, hence this is split into multiple PRs. In this PR, `@outer_dyn_drop_inner_most_dim` is replaced with: * `@contiguous_inner_most_dynamic_outer` I am also adding a similar test for scalable vectors. In addition, * `@drop_two_inner_most_dim` and `@drop_two_inner_most_dim_scalable_inner_dim`, are renamed as `@contiguous_inner_most` and `@contiguous_inner_most_scalable_inner_dim`, respectively, to match their counterpart for `xfer_read`. NOTE: This PR is limited to tests for `vector.transfer_write` This is a follow-up for: #94490, #94604, #94906