[chore][receivercreator] Replace positional arguements with named (open-telemetry#36910)

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#### Description

This PR replace positional arguements with named in struct
initialization. Addresses
open-telemetry#36581 (comment)

Signed-off-by: ChrsMark <[email protected]>

Author: ChrsMark

receiver/receivercreator/config_test.go

@@ -90,7 +90,7 @@ func TestLoadConfig(t *testing.T) {
 						Rule:               `type == "port"`,
 						ResourceAttributes: map[string]any{"one": "two"},
 						rule:               portRule,
-						signals:            receiverSignals{true, true, true},
+						signals:            receiverSignals{metrics: true, logs: true, traces: true},
 					},
 					"nop/1": {
 						receiverConfig: receiverConfig{
@@ -103,7 +103,7 @@ func TestLoadConfig(t *testing.T) {
 						Rule:               `type == "port"`,
 						ResourceAttributes: map[string]any{"two": "three"},
 						rule:               portRule,
-						signals:            receiverSignals{true, true, true},
+						signals:            receiverSignals{metrics: true, logs: true, traces: true},
 					},
 				},
 				WatchObservers: []component.ID{

receiver/receivercreator/discovery.go

@@ -124,7 +124,7 @@ func (builder *k8sHintsBuilder) createScraper(
 	}
 
 	recTemplate, err := newReceiverTemplate(fmt.Sprintf("%v/%v_%v", subreceiverKey, pod.UID, port), userConfMap)
-	recTemplate.signals = receiverSignals{true, false, false}
+	recTemplate.signals = receiverSignals{metrics: true, logs: false, traces: false}
 
 	return &recTemplate, err
 }

receiver/receivercreator/observerhandler_test.go

@@ -78,7 +78,7 @@ func TestOnAddForMetrics(t *testing.T) {
 					rule:               portRule,
 					Rule:               `type == "port"`,
 					ResourceAttributes: map[string]any{},
-					signals:            receiverSignals{true, true, true},
+					signals:            receiverSignals{metrics: true, logs: true, traces: true},
 				},
 			}