Batch activity updates while merging organizations

[epipav]

Changes proposed ✍️

What

🤖 Generated by Copilot at 555b22c

Improved the performance of updateOrganizationInActivities method in organizationRepository.ts by using a batch update strategy. This method is used to migrate activities when an organization is merged or deleted.
​

🤖 Generated by Copilot at 555b22c

updateOrganization
Batch strategy for speed
Autumn leaves falling

Why

How

🤖 Generated by Copilot at 555b22c

• Improve performance and avoid locking issues when updating activities for organization migration (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.