fix data branch edge cases

[gouhongshen]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #24924

What this PR does / why we need it:

This PR adds and fixes BVT coverage for data branch edge cases from #24924, then fixes the underlying failures found by those cases.

Root causes covered include unsafe clone SQL rewriting for string literals and quoted identifiers, unescaped internal SQL literals for apostrophe identifiers, missing data branch diff/merge/PICK support for decimal256/year/geometry/enum and other edge types, partitioned table change collection panics, unstable PICK validation errors, and explicit transaction rejection for DATA BRANCH DIFF/MERGE.

The changes also update branch_matrix_coverage and branch_unhappy_path expected results after manually checking that the generated results match the intended semantics. The invalid DATA BRANCH PICK src INTO dst grammar extension was removed; incomplete PICK syntax remains rejected by the parser.

Validation:

• make build
• git diff --check
• no @bvt:issue / @skip tags in the three acceptance BVT files below
• mo-tester branch_matrix_coverage: 99/99 passed, ignored:0
• mo-tester branch_unhappy_path: 63/63 passed, ignored:0
• mo-tester branch_edge_cases: 109/109 passed, ignored:0
• targeted Go tests for frontend, databranchutils, container/types, parser tree/mysql, sql/plan, sql/compile, objectio/mergeutil, and disttae