Geo - Fix migration to migrate LFS objects entries into their own registry table

What does this MR do?

This MR rectify a mistake I have made in !18415 (comment 238006177). The INSERT of the new data into lfs_object_registry should have happened before the new code is booted. And the adding of the TRIGGER was intended to exist while old code was running and to be removed after new code is booted.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.

Closes #10067 (closed)