Hide displays of certain plans on billings page

What does this MR do?

Whenever an admin visits the billings page of a namespace, we fetch the plans information via CustomersDot and then cache it for a day.

The CustomersDot returns a JSON with the list of plans to be shown and used on the billings page.

Certain plans needs to be hidden from the billings page to be used by the customer like EDU/OSS, Trials etc.

The MR https://gitlab.com/gitlab-org/customers-gitlab-com/-/merge_requests/3125 sends the hide_card information from the CustomersDot to SaaS which is used then by this MR to hide the plans on the Billings Page

Screenshots (strongly suggested)

Before	After

Conformity

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Related to #322043 (closed)