(1.37) Move resource managers page to new section

### What should change?

Making sure to **work on the _dev-1.37_ branch**, move `/docs/concepts/workloads/resource-managers/` to `/docs/concepts/resource-management/resource-managers/`.

We should also edit the redirects source file (see [`static/_redirects.base`](https://github.com/kubernetes/website/blob/main/static/_redirects.base)) to redirect from the old to the new URL; use a 308 (permanent) redirect.

The PR needs to target the branch _dev-1.37_ rather than _main_.

### Why is this needed

For v1.37, we'll have a new documentation section, Resource Management ([_preview_](https://deploy-preview-55932--kubernetes-io-main-staging.netlify.app/docs/concepts/resource-management/))

https://kubernetes.io/docs/concepts/workloads/resource-managers/ is about resource management, and should move to that new section.

It's a time critical change.

**Comments**
/triage accepted
/language en
/priority important-soon

If you use AI to work on this, you **must** disclose that in the PR description.

/help

Work on the dev-1.37 branch. Move /docs/concepts/workloads/resource-managers/ to /docs/concepts/resource-management/resource-managers/, then update static/_redirects.base with a 308 redirect from the old URL to the new one. Done means the page is in the new section, the redirect is present, and the PR targets dev-1.37 rather than main.

Written by the indexing model from the issue text.