tests: Default to LOCAL_FS for pageserver remote storage (#5402)

Part of #5172. Builds upon #5243, #5298. Includes the test changes:
- no more RemoteStorageKind.NOOP
- no more testing of pageserver without remote storage
- benchmarks now use LOCAL_FS as well

Support for running without RemoteStorage is still kept but in practice,
there are no tests and should not be any tests.

Co-authored-by: Christian Schwarz <christian@neon.tech>

pageserver/src/bin/pageserver.rs

@@ -644,7 +644,7 @@ fn create_remote_storage_client(
     let config = if let Some(config) = &conf.remote_storage_config {
         config
     } else {
-        // No remote storage configured.
+        tracing::warn!("no remote storage configured, this is a deprecated configuration");
         return Ok(None);
     };