Rework upgradeable loader cli (bp #14209) (#14337)

* Rework upgradeable loader cli (#14209)

(cherry picked from commit 3316e7166c)

# Conflicts:
#	cli/src/cli.rs
#	cli/tests/program.rs

* fix conflicts

Co-authored-by: Jack May <jack@solana.com>

clap-utils/src/keypair.rs

@@ -58,6 +58,15 @@ impl CliSignerInfo {
             Some(0)
         }
     }
+    pub fn index_of_or_none(&self, pubkey: Option<Pubkey>) -> Option<usize> {
+        if let Some(pubkey) = pubkey {
+            self.signers
+                .iter()
+                .position(|signer| signer.pubkey() == pubkey)
+        } else {
+            None
+        }
+    }
 }
 
 pub struct DefaultSigner {