Add route not allowed status for GWAPI routes

[rainest]

When a GWAPI Route controller cannot ingest a Route because it does not match any of the listeners' AllowedRoutes criteria, we should set a status indicating this.

This status does not yet exist upstream. Adding it is blocked on related pending upstream changes. See #2389 (comment) for details.

[shaneutt]

Blocked on kubernetes-sigs/gateway-api#1111, which appears to be requesting something similar that can serve the same purpose. Over a week ago someone mentioned they were taking it on, I'm inquiring whether they're still doing that and if so we'll continue holding this as blocked and if not I'll make the PR myself.

[shaneutt]

Alright looks like I'll be taking on kubernetes-sigs/gateway-api#1111, unblocked.

[shaneutt]

After doing some more catching up on recent events in Gateway, it looks like https://github.com/kubernetes-sigs/gateway-api/pull/1114/files actually provided what we need to resolve this as we were just looking for a status update for invalid routes. So now the implementation is to simply mark accepted as false and provide a clear reason when a route is rejected and we should be all set. this does not however need to hold up the milestone so I'm removing that.

[rainest]

This appears to be done as of 525b2f4

After that we began appending Gateways with not allowed reasons to route status. Closing pending something I'm missing, but I can't think of anything:

kubernetes-ingress-controller/internal/controllers/gateway/route_utils.go

Lines 224 to 257 in 525b2f4

	} else {
	// We failed to match a listener with this route
	// This will also catch a case of not matching listener/section name.
	reason := RouteReasonNoMatchingParent
	if matchingHostname != nil && *matchingHostname == metav1.ConditionFalse {
	// If there is no matchingHostname, the gateway Status Condition Accepted
	// must be set to False with reason NoMatchingListenerHostname
	reason = gatewayv1beta1.RouteReasonNoMatchingListenerHostname
	} else if (parentRef.Port != nil) && !portMatched {
	// If ParentRef specified a Port but none of the listeners matched, the gateway Status
	// Condition Accepted must be set to False with reason NoMatchingListenerPort
	reason = RouteReasonNoMatchingParent
	} else if !allowedByAllowedRoutes || !allowedBySupportedKinds {
	reason = gatewayv1beta1.RouteReasonNotAllowedByListeners
	}
	var listenerName string
	if parentRef.SectionName != nil && *parentRef.SectionName != "" {
	listenerName = string(*parentRef.SectionName)
	}
	gateways = append(gateways, supportedGatewayWithCondition{
	gateway: &gateway,
	listenerName: listenerName,
	condition: metav1.Condition{
	Type: string(gatewayv1beta1.RouteConditionAccepted),
	Status: metav1.ConditionFalse,
	Reason: string(reason),
	},
	})
	}
	}