Fix NLB listener -> target group association for TF & CF

[rifelpet]

The old code made the incorrect assumption that the NLB's list of TargetGroup tasks is in the same order as the NLB's list of listeners for their associations.
Because the model adds them in opposite orders this resulted in the TLS listener being forwarded to the TCP TG and vice versa.

This updates the terraform and cloudformation generation code to search the NLB's list of target groups by name for the target group that should be associated with the listener.

This matches the logic used in the "direct" target:

kops/upup/pkg/fi/cloudup/awstasks/network_load_balancer.go

Lines 87 to 95 in a140168

	var tgARN string
	for _, tg := range targetGroups {
	if fi.StringValue(tg.Name) == e.TargetGroupName {
	tgARN = fi.StringValue(tg.ARN)
	}
	}
	if tgARN == "" {
	return nil, fmt.Errorf("target group not found for NLB listener %+v", e)
	}

fixes #10562

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rifelpet

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [rifelpet]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[hakman]

Looks legit.
/lgtm