Moving pre-packaged to Incident Collaboration v1.5.0 (#17022)

* Moving pre-packaged to Incident Collaboration v1.5.0

* 1.5.1 instead

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/feature_flags.go

@@ -35,7 +35,7 @@ func (f *FeatureFlags) SetDefaults() {
 	f.CollapsedThreads = false
 	f.FilesSearch = false
 	f.CustomUserStatuses = false
-	f.PluginIncidentManagement = "1.4.0"
+	f.PluginIncidentManagement = "1.5.1"
 }
 
 func (f *FeatureFlags) Plugins() map[string]string {