fix(pageserver): write to both v1+v2 for aux tenant import (#8316)

close #8202 ref
#6560

For tenant imports, we now write the aux files into both v1+v2 storage,
so that the test case can pick either one for testing. Given the API is
only used for testing, this looks like a safe change.

Signed-off-by: Alex Chi Z <chi@neon.tech>

storage_controller/src/service.rs

@@ -4062,7 +4062,14 @@ impl Service {
                 placement_policy: Some(PlacementPolicy::Attached(0)), // No secondaries, for convenient debug/hacking
 
                 // There is no way to know what the tenant's config was: revert to defaults
-                config: TenantConfig::default(),
+                //
+                // TODO: remove `switch_aux_file_policy` once we finish auxv2 migration
+                //
+                // we write to both v1+v2 storage, so that the test case can use either storage format for testing
+                config: TenantConfig {
+                    switch_aux_file_policy: Some(models::AuxFilePolicy::CrossValidation),
+                    ..TenantConfig::default()
+                },
             })
             .await?;