feat: allow newer migrations in alembic to allow for rollback

[jordanrfrazier]

allow newer migrations in alembic to allow for rollback

[coderabbitai]

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[Copilot]

Pull request overview

This PR enables Langflow to handle scenarios where the database has newer migrations than the codebase, allowing for rollback capabilities. This is useful when reverting to an older version of the code after running newer migrations that are backwards-compatible.

Key changes:

• Added detection logic to identify when the database is ahead of the code
• Modified error handling to allow startup when the database has backwards-compatible newer migrations
• Restructured exception handling flow to check for database-ahead scenarios before attempting upgrades

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/backend/base/langflow/services/database/service.py	Added helper methods to detect and handle database-ahead scenarios, and integrated them into the migration checking flow
src/backend/base/langflow/services/database/utils.py	Restructured exception handling to check for database-ahead scenarios and handle different error types separately

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[jordanrfrazier]

Intentionally making minimal changes and not fixing existing tests (or bugs). intended to be a small patch on the cloud, then all fixes will be done with upcoming v1.7 release.