feat(config): add is_patroni_postgresql flag to database configurations

[nahuel11500]

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[Copilot]

Pull Request Overview

This PR adds an is_patroni_postgresql flag to database configurations to explicitly control Patroni PostgreSQL-specific behavior instead of relying on environment variable detection.

• Adds is_patroni_postgresql parameter to AlembicMigrationHelper constructor
• Removes environment variable-based detection in favor of explicit configuration
• Updates test configurations to use new unified list format instead of dictionary format

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/chartreuse/utils/alembic_migration_helper.py	Adds is_patroni_postgresql parameter and removes environment-based detection
src/chartreuse/tests/unit_tests/test_chartreuse.py	Converts test configurations from dictionary to list format
src/chartreuse/config_loader.py	Reduces supported dialects to only postgresql and clickhouse
src/chartreuse/chartreuse.py	Passes is_patroni_postgresql flag to migration helper
example/simple-config.yaml	Adds is_patroni_postgresql field to example configurations
example/multi-database-config.yaml	Adds is_patroni_postgresql field to example configurations

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