E2E deposit testing overhaul (#11667)

* rewrite/refactor deposit testing code

keep track of sent deposits so that they can be compared in detail with
the validator set retreived from the API.

* fix bugs in evaluator and retry

* lint + deepsource appeasement

* typo s/Sprintf/Printf/

* gosec, more like nosec

* fix gosec number - 204->304

* type switch to get signed block from container

* improve comments

* centralizing constants and adding comments

* lock around Depositor to avoid future races

Co-authored-by: Kasey Kirkham <kasey@users.noreply.github.com>

runtime/interop/generate_keys_test.go

@@ -39,6 +39,6 @@ func TestKeyGenerator(t *testing.T) {
 			continue
 		}
 		assert.DeepEqual(t, key.Marshal(), nKey)
-		fmt.Println(fmt.Sprintf("pubkey: %s privkey: %s ", hexutil.Encode(pubkeys[i].Marshal()), hexutil.Encode(key.Marshal())))
+		fmt.Printf("pubkey: %s privkey: %s \n", hexutil.Encode(pubkeys[i].Marshal()), hexutil.Encode(key.Marshal()))
 	}
 }