opampextension: migrate to newer semconv version (open-telemetry#35393)

Description: The version of semconv is upgraded from v1.18.0 to v1.27.0

This is a trivial upgrade. The semconv attributes' value have been
compared using
[go-otel-semconv-comparator](https://github.com/narcis96/go-otel-semconv-comparator).
All attributes used by this component have the same value in both
versions.

Link to tracking Issue:
open-telemetry#22095

Testing: Tests passed

extension/opampextension/opamp_agent.go

@@ -23,7 +23,7 @@ import (
 	"go.opentelemetry.io/collector/component/componentstatus"
 	"go.opentelemetry.io/collector/confmap"
 	"go.opentelemetry.io/collector/extension"
-	semconv "go.opentelemetry.io/collector/semconv/v1.18.0"
+	semconv "go.opentelemetry.io/collector/semconv/v1.27.0"
 	"go.uber.org/zap"
 	"golang.org/x/exp/maps"
 	"gopkg.in/yaml.v3"

extension/opampextension/opamp_agent_test.go

@@ -18,7 +18,7 @@ import (
 	"go.opentelemetry.io/collector/component/componenttest"
 	"go.opentelemetry.io/collector/confmap/confmaptest"
 	"go.opentelemetry.io/collector/extension/extensiontest"
-	semconv "go.opentelemetry.io/collector/semconv/v1.18.0"
+	semconv "go.opentelemetry.io/collector/semconv/v1.27.0"
 )
 
 func TestNewOpampAgent(t *testing.T) {