DB Mismatch Fix for Country Entity ,User Category and Volunteer Entity

[keerthireddy1612]

Resolve database schema mismatches by aligning JPA entity mappings with the current database structure to ensure consistent and error-free persistence operations.

[keerthireddy1612]

Fixed volunteer_detail_id schema mismatch and currently working with DB team to make changes for Country Entity.

[keerthireddy1612]

Updated the Country , userCategory , Volunteer entities and pushed the to test branch

[sxmeer]

Updated State model
Integer stateId -> String stateId