refactor: consolidated rollback log functions

Combined the logic of GetRollbackLogs and CopyRollbackLogs into a single function, GetAndCopyRollbackLogs.
This improves readability and maintainability by grouping related operations. Also updated comments for accuracy.

Bug: 394172800
Change-Id: I2308bc0b4a0bf5d558c7031bd9931fe0654f167b