Add support for approving InstallPlans with multiple CSVs

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>