Remove direct access to v2.Context.StatusReporter in Filestream (#48075)

v2.Context.StatusReporter can be nil when Filebeat runs
standalone. The direct access to this field is replaced in Filestream
by the UpdateStatus method. A deprecation notice is added is added to
the StatusReporter field.

(cherry picked from commit 72314a0)

Author: belimawr

filebeat/input/filestream/internal/input-logfile/harvester.go

@@ -210,7 +210,7 @@ func startHarvester(
 
 			// Report any harvester error as a degraded state for the input
 			if err != nil {
-				ctx.StatusReporter.UpdateStatus(
+				ctx.UpdateStatus(
 					status.Degraded,
 					fmt.Sprintf("Harvester for Filestream input %q failed: %s", inputID, err),
 				)

filebeat/input/v2/input.go

@@ -104,6 +104,8 @@ type Context struct {
 	// StatusReporter provides a method to update the status of the underlying unit
 	// that maps to the config. Note: Under standalone execution of Filebeat this is
 	// expected to be nil.
+	// Deprecated: Direct access to StatusReporter is deprecated because it
+	// can be nil, use the UpdateStatus method instead
 	StatusReporter status.StatusReporter
 
 	// MetricsRegistry is the registry collecting metrics for the input using