trigger: fix context apply (aquasecurity#2090)

Fixes applying the context from triggering event.
Previously the invoking context was applied with a reference assignment
however when the value went out of scope the reference popped back
to the previous value.

Also adds ContainerID and ProcessName to happy path tests as they are
critical fields.

pkg/ebpf/events_processor.go

@@ -413,7 +413,11 @@ func (t *Tracee) processEvent(event *trace.Event) error {
 		if err != nil {
 			return fmt.Errorf("failed to apply invoke context on %s event: %s", event.EventName, err)
 		}
-		event = &withInvokingContext
+
+		// this was previously event = &withInvokingContext
+		// however, if applied as such, withInvokingContext will go out of scope and the reference will be moved back
+		// as such we apply the value internally and not through a referene switch
+		(*event) = withInvokingContext
 	}
 
 	return nil

pkg/events/trigger/context_test.go

@@ -25,14 +25,18 @@ func TestContext_Apply(t *testing.T) {
 				EventName:   "open",
 				Timestamp:   123,
 				ProcessID:   5,
+				ContainerID: "abc123",
+				ProcessName: "insmod",
 				ReturnValue: 2,
 			},
 			inputEvent: trace.Event{
-				EventID:   int(events.PrintNetSeqOps),
-				EventName: "print_net_seq_ops",
-				Timestamp: 187,
-				ProcessID: 0,
-				ArgsNum:   3,
+				EventID:     int(events.PrintNetSeqOps),
+				EventName:   "print_net_seq_ops",
+				Timestamp:   187,
+				ProcessID:   0,
+				ArgsNum:     3,
+				ContainerID: "",
+				ProcessName: "tracee-ebpf",
 				Args: []trace.Argument{
 					{
 						ArgMeta: trace.ArgMeta{
@@ -63,6 +67,8 @@ func TestContext_Apply(t *testing.T) {
 				Timestamp:   123,
 				ProcessID:   5,
 				ReturnValue: 0,
+				ContainerID: "abc123",
+				ProcessName: "insmod",
 				ArgsNum:     3,
 				Args: []trace.Argument{
 					{