Add parsing logic for User-Agent headers (#5645)

* feat(ts_telemetry): add parsing logic for user agent headers

* feat(ts_telemetry): update gRPC observability for user-agent headers

* feat(ts_telemetry): add observation tags

* feat(ts_telemetry): Resolved comments

* feat(ts_telemetry): Removed loop variable capture

* feat(ts_telemetry): Updated userAgentKey to be inline

* feat(ts_telemetry): Add support for userAgent as per RFC 9110

* feat(ts_telemetry): Resolved comments

* Fix newline

* feat(ts_telemetry): Moved user-agent parsing to interceptor

* feat(ts_telemetry): Added user-agent parsing complex test case

* Update userAgentsKey comment

Co-authored-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>

* feat(ts_telemetry): Updated changelog

* feat(ts_telemetry): Resolved comments

---------

Co-authored-by: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>

internal/gen/controller/api/services/authtokens_service.pb.go

@@ -28,7 +28,7 @@ const (
 
 type GetAuthTokenRequest struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
-	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty" class:"public"` // @gotags: `class:"public"`
+	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty" class:"public" eventstream:"observation"` // @gotags: `class:"public" eventstream:"observation"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }