fix reconcilePrimaryHpa doesn't fall back to v2beta2

[c19]

So the problems is I'm using flagger 1.22 on a 1.19 eks. which doesn't has hpa v2, but has hpa v2beta2.
from the falling back to v2beta2 log and latter creating HorizontalPodAutoscaler v2 log. we can tell that it's not going to the expected if branch. which I think it's due to failed hpa query while has error, still return something for hpa.

log:

{"level":"debug","ts":"2022-07-19T07:28:06.449Z","caller":"canary/hpa_reconciler.go:41","msg":"v2 HorizontalPodAutoscaler apps.my-app get query error: %!w(*errors.StatusError=&{{{ } {   <nil>} Failure the server could not find the requested resource NotFound 0xc0002e58c0 404}}); falling back to v2beta2"}
{"level":"info","ts":"2022-07-19T07:28:06.459Z","caller":"controller/events.go:45","msg":"creating HorizontalPodAutoscaler v2 my-app-primary.apps failed: the server could not find the requested resource","canary":"my-app.apps"}
{"level":"debug","ts":"2022-07-19T07:28:06.459Z","logger":"event-broadcaster","caller":"record/event.go:285","msg":"Event(v1.ObjectReference{Kind:\"Canary\", Namespace:\"apps\", Name:\"my-app\", UID:\"324fcec9-3d8f-479f-879d-c9fdad3e3ee9\", APIVersion:\"flagger.app/v1beta1\", ResourceVersion:\"1058290968\", FieldPath:\"\"}): type: 'Warning' reason: 'Synced' creating HorizontalPodAutoscaler v2 my-app-primary.apps failed: the server could not find the requested resource"}

I tested on my 1.19 eks. works fine.

[aryan9600]

Hi @c19, thanks for catching the issue and opening this PR! Please sign off your commit.

[aryan9600]

Suggested change

	hpa = nil;
	hr.logger.Debugf("v2 HorizontalPodAutoscaler %s.%s get query error: %w; falling back to v2beta2",
	hpa = nil
	hr.logger.Debugf("v2 HorizontalPodAutoscaler %s.%s get query error: %s; falling back to v2beta2",

[aryan9600]

Superseded by #1242