Remove the offering column added for rollback purpose

**Describe the task**
During the implementation of the hotfix ticket #6161 a column was added to offerings table to copy the study_breaks calculated values to perform rollback. After few sprints from `Hotfix v4.0.1` this column must be remove as a part of cleanup.

**Acceptance Criteria**
- [ ] Remove the column `study_breaks_before_update` from sims.education_programs_offerings and sims.education_programs_offerings_history.

Locate the database schema or migration definitions for sims.education_programs_offerings and sims.education_programs_offerings_history, then inspect how the rollback column was added. Remove study_breaks_before_update from both tables and verify that the schema no longer contains either column.

Written by the indexing model from the issue text.