test: improve test coverage for pkg/datasource/sql/util

[everfid-ever]

Which issue(s) this PR fixes:

Fixes #946

[Copilot]

Pull Request Overview

This PR adds comprehensive test coverage for the SQL utility package, introducing test files for core functionality including row scanning, parameter conversion, lock key generation, context-aware operations, and type conversion utilities.

Key changes:

• Added extensive test coverage for ScanRows operations including iteration, scanning, context cancellation, and result set handling
• Implemented tests for parameter conversion between NamedValue and Value types
• Created tests for lock key generation with various primary key configurations
• Added tests for context-aware database operations (prepare, exec, query)
• Expanded test coverage for type conversion and database version parsing

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/datasource/sql/util/sql_test.go	Tests for ScanRows including Next, Scan, Close, context handling, and result sets
pkg/datasource/sql/util/params_test.go	Tests for NamedValue/Value conversion utilities
pkg/datasource/sql/util/lockkey_test.go	Tests for BuildLockKey with single/composite keys and edge cases
pkg/datasource/sql/util/ctxutil_test.go	Tests for context-aware driver operations (prepare, exec, query)
pkg/datasource/sql/util/convert_test.go	Expanded tests for type conversion and database version parsing

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.56%. Comparing base (0747d09) to head (73887e8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #974      +/-   ##
==========================================
+ Coverage   48.49%   51.56%   +3.06%     
==========================================
  Files         199      199              
  Lines       12329    12329              
==========================================
+ Hits         5979     6357     +378     
+ Misses       5880     5482     -398     
- Partials      470      490      +20     

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