[release-1.15] Make adapter pkg independent from brokerfilter package

[creydr]

In the apiserversource receive adapter for 1.15 (not on main), we see the following errors

W1204 13:41:06.207735       1 reflector.go:539] k8s.io/[email protected]/tools/cache/reflector.go:229: failed to list *v1.Secret: secrets is forbidden: User "system:serviceaccount:default:api-src-user" cannot list resource "secrets" in API group "" in the namespace "knative-eventing"
E1204 13:41:06.207756       1 reflector.go:147] k8s.io/[email protected]/tools/cache/reflector.go:229: Failed to watch *v1.Secret: failed to list *v1.Secret: secrets is forbidden: User "system:serviceaccount:default:api-src-user" cannot list resource "secrets" in API group "" in the namespace "knative-eventing"

This is because of the dependency of the adapter package to brokerfilters which use the secret informers

eventing/cmd/apiserver_receive_adapter/main.go

Line 23 in 329aebc

"knative.dev/eventing/pkg/adapter/apiserver"

->

eventing/pkg/adapter/apiserver/adapter.go

Line 37 in 329aebc

brokerfilter "knative.dev/eventing/pkg/broker/filter"

->

eventing/pkg/broker/filter/server_manager.go

Line 30 in 329aebc

secretinformer "knative.dev/pkg/injection/clients/namespacedkube/informers/core/v1/secret"

This PR addresses it and uses the subscriptionapi refactoring from #8122 to remove this dependency

[pierDipi]

/lgtm
/approve

[knative-prow]

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