Backport #29183 explore and generic widget lazy-loading to 1.13

[shah-harshit]

Summary

• Direct stacked backport for OSS sequence seq38: perf(ui): lazy load explore, generic widgets, and shared pages #29183.
• Uses the already reviewed 1.13 backport resolution from Backport explore and generic widget lazy loading to 1.13 #30795.
• 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 explore, generic widgets, and shared pages #29183
• Source commit(s): ec1644a
• Common branch backport PR: Backport explore and generic widget lazy loading to 1.13 #30795
• Cherry-picked commit: 463e351
• Depends on: ui/direct-1.13-seq37-29181-task-incident-profiler-split

Testing

• git diff --check HEAD~1..HEAD

[gitar-bot]

Code Review ✅ Approved

Backports explore and generic widget lazy-loading features to release 1.13 via stacked cherry-pick. No issues found.

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