fix-more-sql-syntax-issues (closes #20453)

[idseefeld]

Prerequisites

All unit & integration test for SQLite & SQL Server should run successfully.

Changes are meaningful for my PostgreSQL provider: https://github.com/idseefeld/Umbraco-CMS/tree/v173/postgreSqlProvider

[github-actions]

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[Copilot]

Pull request overview

This PR fixes SQL syntax issues to support PostgreSQL provider compatibility. The changes standardize column name casing to lowercase, replace ExecuteScalar with FirstOrDefault for better database compatibility, add PostgreSQL sequence support, and refactor database insertion methods to use a centralized approach with DTO-based table/column name constants.

Key changes:

• Standardized column naming to use lowercase and constants from DTOs
• Added sequence support infrastructure for PostgreSQL compatibility
• Refactored database insertion to use a centralized Insert<T> method
• Changed ExecuteScalar calls to FirstOrDefault for consistency

Reviewed changes

Copilot reviewed 110 out of 110 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ContentTypeRepositorySqlClausesTest.cs	Fixed column name casing in test assertions (Id → id, UniqueId → uniqueId)
NPocoSqlExtensionsTests.cs	Updated test to expect LOWER() wrapper for case-insensitive string comparisons
DictionaryTranslationMapperTest.cs	Fixed expected column name casing (UniqueId → uniqueId)
DatabaseCacheRepository.cs	Refactored update logic from InsertOrUpdate to explicit Insert/Update with typed queries
UserIdKeyResolver.cs	Changed ExecuteScalar to FirstOrDefault for consistency
UmbracoDatabaseFactory.cs	Changed visibility to protected for extensibility
UmbracoDatabaseExtensions.cs	Changed ExecuteScalar to FirstOrDefault
SqlSyntaxProviderBase.cs & ISqlSyntaxProvider.cs	Added GetNullExtension, SupportsSequences, and AlterSequences methods for PostgreSQL
Multiple Repository files	Standardized to use QuoteColumnName helpers and typed SQL builders
All DTO files	Added PrimaryKeyName constants and updated Column attributes to use constants
DatabaseDataCreator.cs	Major refactoring: centralized Insert method, removed table/column name strings
DatabaseSchemaCreator.cs	Added sequence support after identity insert operations
DatabaseSchemaInitializedNotification.cs	New notification class for database schema initialization
Constants-DatabaseSchema.cs	Added common primary key and column name constants
Multiple API Controller files	Changed from nameof() to using NodeDto column name constants