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This PR adds support for supplying the tenant config upon /attach. Before this change, when relocating a tenant using `/detach` and `/attach`, the tenant config after `/attach` would be the default config from `pageserver.toml`. That is undesirable for settings such as the PITR-interval: if the tenant's config on the source was `30 days` and the default config on the attach-side is `7 days`, then the first GC run would eradicate 23 days worth of PITR capability. The API change is backwards-compatible: if the body is empty, we continue to use the default config. We'll remove that capability as soon as the cloud.git code is updated to use attach-time tenant config (https://github.com/neondatabase/neon/issues/4282 keeps track of this). unblocks https://github.com/neondatabase/cloud/issues/5092 fixes https://github.com/neondatabase/neon/issues/1555 part of https://github.com/neondatabase/neon/issues/886 (Tenant Relocation) Implementation ============== The preliminary PRs for this work were (most-recent to least-recent) * https://github.com/neondatabase/neon/pull/4279 * https://github.com/neondatabase/neon/pull/4267 * https://github.com/neondatabase/neon/pull/4252 * https://github.com/neondatabase/neon/pull/4235