Remove unused SubscriptionsHelper methods

Josianne Hysonrequested to merge
jh/clean_up_subscription_helper into master

What does this MR do and why?

Part of issue: https://gitlab.com/gitlab-org/gitlab/-/issues/472721+

Remove unused methods in the SubscriptionsHelper. All the code that previously called these methods has been removed (the purchase flows were migrated to GitLab).

References

  1. Epic that made this functionality obsolete: https://gitlab.com/groups/gitlab-org/-/epics/9569+

How to set up and validate locally

This is removing unused code, so there isn't any specific to test. We can regression test the purchase flow:

  1. Ensure you have CustomersDot running and the GDK in SaaS mode
  2. Create a new top level group
  3. Navigate to Settings > Billing
  4. Select a paid plan and complete the purchase flow

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Josianne Hyson

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