[9.1] (backport #10851) Allow different beats versions in integration tests (#10864)

* Allow different beats versions in integration tests (#10851)

(cherry picked from commit 89c9b27)

# Conflicts:
#	testing/integration/ess/otel_test.go

* Fix conflicts

---------

Co-authored-by: Mikołaj Świątek <[email protected]>

Author: mergify[bot]

testing/integration/ess/beat_receivers_test.go

@@ -375,7 +375,7 @@ func TestClassicAndReceiverAgentMonitoring(t *testing.T) {
 			"agent.ephemeral_id",
 			// agent.id is different because it's the id of the underlying beat
 			"agent.id",
-			// agent.version is different because we force version 9.0.0 in CI
+			// for short periods of time, the beats binary version can be out of sync with the beat receiver version
 			"agent.version",
 			"data_stream.namespace",
 			"elastic_agent.id",
@@ -596,6 +596,9 @@ outputs:
 			"event.ingested",
 			"event.duration",
 
+			// for short periods of time, the beats binary version can be out of sync with the beat receiver version
+			"agent.version",
+
 			// only in receiver doc
 			"agent.otelcol",
 			"agent.otelcol.component.id",

testing/integration/ess/otel_test.go

@@ -1623,6 +1623,8 @@ service:
 		"@timestamp",
 		"agent.ephemeral_id",
 		"agent.id",
+
+		// for short periods of time, the beats binary version can be out of sync with the beat receiver version
 		"agent.version",
 
 		// Missing from fbreceiver doc
@@ -1983,7 +1985,7 @@ receivers:
             - cpu
     output:
       otelconsumer:
-    queue.mem.flush.timeout: 0s	  
+    queue.mem.flush.timeout: 0s
 exporters:
   elasticsearch/log:
     endpoints: