perf: Prune matched right rows in nested loop semi and anti joins

[lyne7-sc]

Which issue does this PR close?

• Closes #.

Rationale for this change

For RightSemi and RightAnti nested loop joins, each right row only needs one match to determine whether it belongs in the result. Currently, matched right rows continue participating in comparisons with subsequent left rows.

Skipping these comparisons can significantly reduce execution time when matches are found early.

What changes are included in this PR?

• Add RightExistenceProbe to track matches and right-side candidates.
• Compact the right-side filter columns when at least half the candidates have matched and more left rows remain.
• Stop probing the current right batch when all its rows have matched.
• Preserve matches in original right-row coordinates for output and spill handling.

What is the testing strategy for this PR?

• Add unit tests for match tracking and candidate compaction.
• Add SQL coverage in nested_loop_join_existence.slt for RightSemi/RightAnti joins, including NULLs, repeated matches, and multiple left rows per probe.
• Extend nested_loop_join_spill.slt to cover RightSemi/RightAnti joins across spilled left chunks.

Are there any user-facing changes?

No. This is an internal performance optimization.

Benchmark results

Case	Scenario	main	This PR	Time change
Q15	Right Semi, early matches	307.659	0.365	-99.88%
Q16	Right Anti, early matches	306.225	0.338	-99.89%
Q18	Right Semi, no matches	7.964	7.728	-2.95%
Q19	Right Anti, no matches	8.100	7.770	-4.07%
Q20	Right Semi, staged compaction	56.082	7.182	-87.19%
Q21	Right Anti, staged compaction	56.057	7.115	-87.31%
Q22	Right Semi, repeated 40% matches (4,096 left × 8,192 right)	12.185	12.410	+1.84%
Q23	Right Anti, final-left-row matches with wide Utf8	0.305125	0.309042	+1.28%

[codecov-commenter]

Codecov Report

❌ Patch coverage is 89.74359% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.33%. Comparing base (606ae0f) to head (b9fb069).
⚠️ Report is 31 commits behind head on main.

Files with missing lines	Patch %	Lines
...fusion/physical-plan/src/joins/nested_loop_join.rs	89.74%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25413      +/-   ##
==========================================
+ Coverage   81.94%   82.33%   +0.38%     
==========================================
  Files        1135     1137       +2     
  Lines      428278   432064    +3786     
  Branches   428278   432064    +3786     
==========================================
+ Hits       350952   355737    +4785     
+ Misses      56369    54822    -1547     
- Partials    20957    21505     +548     

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