Extract abstract MultiQueryParserTestCase to remove test duplication

[JanTvrdik]

Summary

• Extract shared test methods into abstract MultiQueryParserTestCase base class in tests/inc/
• Individual parser tests now contain only data providers and parser-specific overrides (e.g. testFile() with specific query assertions, MySQL's testDelimiter())
• Move test SQL data files from tests/cases/data/ to tests/data/

Test plan

• All 64 tests pass

[Copilot]

Pull request overview

This PR refactors the multi-query parser test suite to eliminate duplication by extracting common test methods into an abstract MultiQueryParserTestCase base class. The refactoring also reorganizes the file structure by moving SQL test data files from tests/cases/data/ to tests/data/.

Changes:

• Created abstract MultiQueryParserTestCase with common test methods (testSuperfluousSemicolons, testEdgeCases, testChunkBoundary, testFile, testFileWithRandomizedChunking, testFileWithAllTwoChunkCombinations, testParseFileThrowsOnNonExistentFile) and helper method randomChunks()
• Refactored MySqlMultiQueryParserTest, PostgreSqlMultiQueryParserTest, and SqlServerMultiQueryParserTest to extend the base class and provide only data providers and parser-specific test overrides
• Moved SQL test data files to a dedicated tests/data/ directory

Reviewed changes

Copilot reviewed 4 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/inc/MultiQueryParserTestCase.php	New abstract base class containing common test methods, abstract method declarations for parser creation and data providers, and shared helper methods
tests/data/sqlserver.sql	SQL Server test data file moved from tests/cases/data/ with schema definitions, sample data, and edge cases for SQL Server-specific syntax
tests/data/postgres.sql	PostgreSQL test data file moved from tests/cases/data/ with schema definitions, sample data, and PostgreSQL-specific features like dollar-quoted strings
tests/data/mysql.sql	MySQL test data file moved from tests/cases/data/ with schema definitions, sample data, and MySQL-specific features like backtick identifiers and hash comments
tests/cases/SqlServerMultiQueryParserTest.phpt	Refactored to extend base class, implements abstract methods, retains SQL Server-specific testFile() override with trigger assertion
tests/cases/PostgreSqlMultiQueryParserTest.phpt	Refactored to extend base class, implements abstract methods, retains PostgreSQL-specific testFile() override with function assertion
tests/cases/MySqlMultiQueryParserTest.phpt	Refactored to extend base class, implements abstract methods, retains MySQL-specific testDelimiter() test

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