fix: revert mistaken metadata changes in resolvers config-observability

Commit 72c59cd (OTel migration) accidentally changed three metadata
fields in config/resolvers/config-observability.yaml that are specific
to the resolvers deployment:
- Copyright year reverted: 2019 → 2022
- Namespace reverted: tekton-pipelines → tekton-pipelines-resolvers
- Restored label: app.kubernetes.io/component: resolvers

The OTel configuration content in the data section is left unchanged.

Author: khrm

config/resolvers/config-observability.yaml

@@ -1,4 +1,4 @@
-# Copyright 2019 The Tekton Authors
+# Copyright 2022 The Tekton Authors
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,8 +16,9 @@ apiVersion: v1
 kind: ConfigMap
 metadata:
   name: config-observability
-  namespace: tekton-pipelines
+  namespace: tekton-pipelines-resolvers
   labels:
+    app.kubernetes.io/component: resolvers
     app.kubernetes.io/instance: default
     app.kubernetes.io/part-of: tekton-pipelines
 data: