test: cover regex expression routing configurations - #5917
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Which issue does this PR close?
Part of #4616.
Rationale for this change
Result comparisons alone can pass through the wrong execution path. These tests verify routing when JVM dispatch is enabled or disabled and when native execution is explicitly opted into.
What changes are included in this PR?
Cover rlike, regexp_extract, regexp_extract_all, regexp_replace and split. Assert native, JVM dispatcher and Spark fallback paths, including unsupported pattern, group index and position arguments after native opt-in.
How are these changes tested?
All 6 fixtures pass on Spark 4.1.3 as part of the 15-test routing run on current main. The original fixtures passed fork CI on Spark 3.4, 3.5, 4.0, 4.1 and 4.2 (run); regexp_extract_all is gated to Spark 3.5+. Apache RAT passed.