Fix array enum renaming

[charlesBochet]

When creating an enum type (let's say post_type_enum), postgres will automatically create a array enum type based on this enum and prefix it with an underscore (so _post_type_enum).

Our code was not taking this case into account while dealing with MULTISELECT

Resources:
https://www.postgresql.org/docs/current/sql-createtype.html

[greptile-apps]

PR Summary

This PR fixes PostgreSQL array enum type handling by properly managing the automatic '_' prefix that PostgreSQL adds to array enum types, particularly affecting MULTISELECT fields.

• Added array type detection in getEnumTypeName by querying data_type from information_schema.columns
• Modified enum type name extraction to remove '_' prefix when dealing with ARRAY data types in getEnumTypeName
• Added specific error handling in getEnumTypeName when column is not found during enum alteration
• Improved handling of array enum types in alterEnum to maintain consistency with PostgreSQL's naming convention

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[Weiko]

LGTM