bench: pwmj right semi/anti existence joins

[SubhamSinghal]

Which issue does this PR close?

• Part of [EPIC]: Make PiecewiseMergeJoin work in Datafusion #17427. Companion to bench: pwmj left semi/anti join #24160, which added this benchmark for the LeftSemi/LeftAnti half.

Rationale for this change

RightSemi/RightAnti range joins plan as NestedLoopJoinExec today, and the existence-join
benchmark added in #24160 does not cover them, so there is no way to say what routing them PiecewiseMergeJoinExec would be worth — before or after such a change lands.

This benchmark runs on either side of it: the pwmj_enabled arm accepts whichever operator the build plans and prints it, so a run on main today is a valid NestedLoopJoinExec baseline that a later build compares straight against.

What changes are included in this PR?

Bench code only, all in datafusion/core/benches/pwmj_semi_anti_sql.rs:

• RIGHT SEMI / RIGHT ANTI cases across the same three match regimes as the existing ones, written out as joins rather than reached through EXISTS (a decorrelated EXISTS gives LeftSemi, and which side a nested-loop join marks is its own choice, so a subquery cannot pin these join types).
• One bench_case runner shared by every case, replacing the previous inline per-case plumbing, driven by a Kind enum with one variant per JoinType. Adding the mark joins later is two more variants rather than a new code path.

Are these changes tested?

The guards above are the tests

Are there any user-facing changes?

No. Benchmark code only.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.23%. Comparing base (54355e1) to head (c6e5c9c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #24458      +/-   ##
==========================================
- Coverage   81.23%   81.23%   -0.01%     
==========================================
  Files        1113     1113              
  Lines      392521   392521              
  Branches   392521   392521              
==========================================
- Hits       318867   318860       -7     
- Misses      54902    54903       +1     
- Partials    18752    18758       +6     

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[neilconway]

@SubhamSinghal Can you fix the clippy issues, please?

[SubhamSinghal]

resolved clippy error but [Detect breaking changes / Check semver (pull_request)] is running from a long time.