Add FailedPostStartHook to unrecoverable pod events list

With the addition of lifecycle hooks to support postStart events, it's
necessary to consider 'FailedPostStartHook' as a fatal event in
workspace startup in order to show more info on workspace failures.
Without this, a workspace will eventually fail with CrashLoopBackoff
instead.

Signed-off-by: Angel Misevski <amisevsk@redhat.com>

pkg/provision/workspace/deployment.go

@@ -54,6 +54,7 @@ var containerFailureStateReasons = []string{
 }
 
 var unrecoverablePodEventReasons = []string{
+	"FailedPostStartHook",
 	"FailedMount",
 	"FailedScheduling",
 	"FailedCreate",