[SPARK-47972][SQL][FOLLOWUP] Restrict CAST expression for collations #46860
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What changes were proposed in this pull request?
Removal of immutable Seq import.
Why are the changes needed?
This import was added with #46474, but in reality is changing behaviour of other AstBuilder.scala rules and because of this needs to be removed.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Existing tests cover this.
Was this patch authored or co-authored using generative AI tooling?
No.