SSH requesting access message (#137)

This PR makes two changes to the status messages we use for SSH requests
in the CLI.

1. Replaces the "Requesting access" status message with a more generic
"Checking for access in P0"
2. Adds the message "Existing access found. Connecting to node." in the
scenario where a user had access approved previously and is waiting to
be connected to the node. Previously we showed nothing.

This only affects `p0 ssh <destination>` and `p0 scp <destination>`. It
does not affect any `p0 request` flows.

Before:


https://github.com/user-attachments/assets/cc0fce18-ab55-4074-af16-14a43a6ce06f


After:


https://github.com/user-attachments/assets/3c31ae41-437f-4328-a798-096710515dcc



Addresses:
https://linear.app/p0-security/issue/ENG-2827/requesting-access-spinner-is-displayed-when-it-shouldnt

---------

Co-authored-by: Gergely Dányi <gergas3@gmail.com>

src/commands/shared/request.ts

@@ -94,13 +94,22 @@ export const request =
     }>,
     authn?: Authn,
     options?: {
+      accessMessage?: string;
       message?: "all" | "approval-required" | "none";
     }
   ): Promise<RequestResponse<T> | undefined> => {
     const resolvedAuthn = authn ?? (await authenticate());
     const { userCredential } = resolvedAuthn;
+    const accessMessage = (message?: string) => {
+      switch (message) {
+        case "approval-required":
+          return "Checking for access in P0";
+        default:
+          return "Requesting access";
+      }
+    };
     const data = await spinUntil(
-      "Requesting access",
+      accessMessage(options?.message),
       fetchCommand<RequestResponse<T>>(resolvedAuthn, args, [
         command,
         ...args.arguments,

src/commands/shared/ssh.ts

@@ -131,6 +131,7 @@ export const provisionRequest = async (
   }
   const { id, isPreexisting } = response;
   if (!isPreexisting) print2("Waiting for access to be provisioned");
+  else print2("Existing access found.  Connecting to instance.");
 
   const provisionedRequest = await waitForProvisioning<PluginSshRequest>(
     authn,