Shared metrics list only shows 100 metrics, hides the rest

Bug Description

The shared metrics list under Experiments will only show 100 metrics, any beyond that get hidden. A customer wrote in about the list not showing all items (https://posthoghelp.zendesk.com/agent/tickets/46489 (moved to PostHog: https://us.posthog.com/project/2/support/tickets/49401)) and I've recreated it on a personal account which can be seen (user 238862 in admin, US region, Default project).

How to reproduce

1. Create 101 shared metrics
2. Note you can't see all of them (I numbered mine 1-110, 90-99 are missing in the list due to sort order)

Additional context

Might also be worth adding a search field on this page, as a user with that many shared metrics might find value in being able to search for them as well.

Debug info

- [ ] PostHog Cloud, Debug information: [please copy/paste from https://us.posthog.com/settings/project-details#variables or https://eu.posthog.com/settings/project-details#variables]
- [ ] PostHog Hobby self-hosted with `docker compose`, version/commit: [please provide]
- [ ] PostHog self-hosted with Kubernetes (deprecated, see [`Sunsetting Kubernetes support`](https://posthog.com/blog/sunsetting-helm-support-posthog)), version/commit: [please provide]

Start at the shared metrics list under Experiments and reproduce the issue by creating 101 shared metrics, as described. Trace how the list is loaded and sorted, then verify that all metrics are visible and that the result remains usable for larger lists; search is additional context rather than a required outcome.