Remove Secret listener from controller

[jasiu001]

This PR is a

• Feature Implementation
• Bug Fix
• Documentation

What this PR does / why we need it:
This fix removes from controller "core sharedInformer" used for getting secret in the case when ServiceBroker or ClusterServiceBroker use authentication to connect with a broker.
SharedInformer shortly after start is synchronized, which causes huge memory usage when a lot of secret resources exist in the cluster (which is the norm at helm3 which keeps charts inside secrets).
The collection of resources can be performed directly by the Kubernetes client as it happens controller_binding during binding operation.

Which issue(s) this PR fixes
Fixes #2824

Please leave this checklist in the PR comment so that maintainers can ensure a good PR.

Merge Checklist:

• New feature
  • Tests
  • Documentation
• SVCat CLI flag
• Server Flag for config
  • Chart changes
  • removing a flag by marking deprecated and hiding to avoid
    breaking the chart release and existing clients who provide a
    flag that will get an error when they try to update

[k8s-ci-robot]

Hi @jasiu001. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mszostok]

/ok-to-test

[mszostok]

Please remove RBAC for secret list and watch as they are not needed anymore

https://github.com/kubernetes-sigs/service-catalog/blob/b6afbc9fec94e7b0d350f22e736d0484d181b351/charts/catalog/templates/rbac.yaml#L19

beside that 👍
/lgtm

[mszostok]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jasiu001, mszostok

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