[to dev/1.3] Fix TVList iterator state across memtable page switches

[shuwenwei]

Backport

Cherry-pick of master PR #18647 to dev/1.3.

Changes

• Preserve a prepared aligned duplicate-timestamp group when a fake-page switch does not move the iterator cursor.
• Clear probeNext after non-aligned batch reads so a later point read cannot consume stale prepared state.
• Add aligned ASC/DESC regression tests.
• Add non-aligned ASC duplicate and DESC deletion batch-to-point regression tests.

dev/1.3 API Adaptation

• The dev/1.3 TVList.iterator API takes seven arguments and does not take QueryContext; the non-aligned tests were adapted accordingly.
• The dev/1.3 AlignedReadOnlyMemChunk constructor takes five arguments and does not include timeColumnDeletion; the aligned tests were adapted accordingly.

Validation

Static API/signature check only. No Maven build, formatting, or test command was run for this backport, as requested.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.12%. Comparing base (60fd1e2) to head (32e5db6).

Additional details and impacted files

@@            Coverage Diff             @@
##             dev/1.3   #18652   +/-   ##
==========================================
  Coverage      45.12%   45.12%           
  Complexity       198      198           
==========================================
  Files           3665     3665           
  Lines         250777   250778    +1     
  Branches       31036    31036           
==========================================
+ Hits          113161   113172   +11     
+ Misses        137616   137606   -10     

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