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## Problem We were seeing timeouts on migrations in this test. The test unfortunately tends to saturate local storage, which is shared between the pageservers and the control plane database, which makes the test kind of unrealistic. We will also want to increase the scale of this test, so it's worth fixing that. ## Summary of changes - Instead of randomly creating timelines at the same time as the other background operations, explicitly identify a subset of tenant which will have timelines, and create them at the start. This avoids pageservers putting a lot of load on the test node during the main body of the test. - Adjust the tenants created to create some number of 8 shard tenants and the rest 1 shard tenants, instead of just creating a lot of 2 shard tenants. - Use archival_config to exercise tenant-mutating operations, instead of using timeline creation for this. - Adjust reconcile_until_idle calls to avoid waiting 5 seconds between calls, which causes timelines with large shard count tenants. - Fix a pageserver bug where calls to archival_config during activation get 404