Fix json type in clickhouse migrations

[FelixMalfait]

Settings in clickhouse are only set for the duration of the session so we need to keep the same client

[greptile-apps]

PR Summary

This PR modifies the ClickHouse migration system to properly handle JSON type settings by maintaining a single client connection throughout the migration process.

• Extracted JSON type enabling logic into new enableJsonType function in /packages/twenty-server/src/database/clickhouse/migrations/run-migrations.ts
• Moved client.close() call to after all migrations complete to maintain session settings
• Added fallback to allow_experimental_json_type if enable_json_type fails
• Added error logging when JSON type enabling fails
• Improved error handling by checking JSON type enabled status before proceeding

_{1 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings | Greptile}