storcon: add use_local_compute_notifications flag (#11333)

## Problem

While working on bulk import, I want to use the `control-plane-url` flag
for a different request.
Currently, the local compute hook is used whenever no control plane is
specified in the config.
My test requires local compute notifications and a configured
`control-plane-url` which isn't supported.

## Summary of changes

Add a `use-local-compute-notifications` flag. When this is set, we use
the local flow regardless of other config values.
It's enabled by default in neon_local and disabled by default in all
other envs. I had to turn the flag off in tests
that wish to bypass the local flow, but that's expected.

---------

Co-authored-by: Arpad Müller <arpad-m@users.noreply.github.com>

control_plane/src/local_env.rs

@@ -184,6 +184,8 @@ pub struct NeonStorageControllerConf {
     pub timelines_onto_safekeepers: bool,
 
     pub use_https_safekeeper_api: bool,
+
+    pub use_local_compute_notifications: bool,
 }
 
 impl NeonStorageControllerConf {
@@ -213,6 +215,7 @@ impl Default for NeonStorageControllerConf {
             use_https_pageserver_api: false,
             timelines_onto_safekeepers: false,
             use_https_safekeeper_api: false,
+            use_local_compute_notifications: true,
         }
     }
 }

control_plane/src/storage_controller.rs

@@ -555,6 +555,10 @@ impl StorageController {
             args.push("--use-https-safekeeper-api".to_string());
         }
 
+        if self.config.use_local_compute_notifications {
+            args.push("--use-local-compute-notifications".to_string());
+        }
+
         if let Some(ssl_ca_file) = self.env.ssl_ca_cert_path() {
             args.push(format!("--ssl-ca-file={}", ssl_ca_file.to_str().unwrap()));
         }