[SPARK-48280][SQL][FOLLOW-UP] Add expressions that are built via expressionBuilder to Expression Walker #48162
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What changes were proposed in this pull request?
Addition of new expressions to expression walker. This PR also improves descriptions of methods in the Suite.
Why are the changes needed?
It was noticed while debugging that startsWith, endsWith and contains are not tested with this suite and these expressions represent core of collation testing.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Test only.
Was this patch authored or co-authored using generative AI tooling?
No.