The operatorpolicy.policy.open-cluster-management.io/managed label is
set to an empty value on the Subscription. The
operatorpolicy.policy.open-cluster-management.io/managed annotation
is set to <policy name>.<policy namespace>.

The label doesn't set a value because the value could be too long.

This will allow querying for subscriptions managed by operator policies.

Signed-off-by: mprahl <mprahl@users.noreply.github.com>

When an InstallPlan contains multiple CSVs, it will be approved if all
CSVs can be approved by the current operator policies.

Rather than query the operator policies directly, the subscriptions in
the namespace that are managed by an operator policy are queried and
then their associated operator policies are queried to avoid having to
resolve templates to see if they manage a subscription in the namespace.

Relates:
https://issues.redhat.com/browse/ACM-11981

Signed-off-by: mprahl <mprahl@users.noreply.github.com>