Backport #29178 activity feed editor formatting lazy-loading to 1.13

[shah-harshit]

Summary

• Direct stacked backport for OSS sequence seq33: perf(ui): lazy load activity feed and split editor formatting #29178.
• Uses the already reviewed 1.13 backport resolution from Backport activity feed editor lazy-loading updates to 1.13 #30790.
• This PR is stacked on the previous sequence branch so it can be reviewed and merged in ticket order.

Tracking

• Source PR(s): perf(ui): lazy load activity feed and split editor formatting #29178
• Source commit(s): 3202dbf
• Common branch backport PR: Backport activity feed editor lazy-loading updates to 1.13 #30790
• Cherry-picked commit: 0f76ecf
• Depends on: ui/direct-1.13-seq30-32-services-lineage-data-insight-lazy

Testing

• git diff --check HEAD~1..HEAD

[github-actions]

❌ PR checklist incomplete

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[gitar-bot]

Code Review ✅ Approved

Backports activity feed editor formatting lazy-loading performance improvements to the 1.13 branch. No issues found.

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