Remove purchase storage button from other storage [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

Background

We have an MVC epic for defining another bucket of storage (e.g. uploads, snippets, artifacts), the MVC is a duplicate of the current storage app in Usage Quotas page with a minor changes (different data source and hiding the purchase button).

Changes

The MR removes "Purchase more storage" button from other storage app (added in !57121 (merged)), the feature would still under a feature flag introduced in !57121 (merged).

Plan

Merge Request	Status
Duplicate the Storage tab under a feature flag (Tests and functionality at once)	!57121 (merged)
Exclude the "purchase more storage" button	👈 You are here
Replace data with new data + update tests	⏳ Upcoming
Replace all duplicated code with original implementation from storage_counter/ or extract it to a shared folder	⏳ Upcoming

Screenshots

before	after

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because the changes are behind a feature flag.
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related to #322897