Split `usage_quotas` License Feature Identifier

To have more control over each tab in usage_quotas page, we need to have more granular License Feature Identifiers than just a catch all usage_quotas identifier

Before we didn't need it because the whole page was hidden in CE or EE unlicensed, but now we'll show the storage tab for all editions, and the remaining tabs only in licensed EE:

EE Unlicensed

Before	After

EE with Premium or Ultimate License

No Change

We are using license feature identifiers to follow the current strategy to guard an EE feature by a license. With each tab using their own key it'll be easier in the future to control which tab to show one by one:

Tab	License Feature Identifier
Seats	:seat_usage_quotas
GitLab Duo Pro	:code_suggestions <- this one already exists
Pipelines	:pipelines_usage_quotas
Storage	Not a licensed feature
Transfer	:transfer_usage_quotas
Product analytics	:product_analytics_usage_quotas

Implementation Plan

MR	Description
Split usage_quotas License Feature Identifier	!148694 (merged)

Old Description

After we have all tabs conditionally rendered in CE we won't need usage_quotas feature because we'll control this page differently:

Functionality	Availability
Usage Quotas Page	All Editions and Distributions
Storage Tab	All Editions and Distributions. Enterprise code in EE using our documented techniques, and SaaS code controlled via Application Settings
Remaining Tabs	Enterprise only. Code in EE conditionally rendered in our app shell, and SaaS code controlled via Application Settings