Inline helper methods to the npm endpoint classes
What does this MR do and why?
This is a follow-up to !154577 (merged), and a preparation for tackling #463822.
Like the earlier MR, this is also a refactoring to remove endpoint_scope-related code branching in the code. For this MR, we're moving methods in the shared helper module into dedicated helper methods of the individual endpoint (project, group, instance) classes. This lets us remove if endpoint == ... branching logic in the code.
MR acceptance checklist
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Screenshots or screen recordings
No UI changes
How to set up and validate locally
Check for regressions in npm install (uses the metadata endpoint) for all three levels:
NOTE: You'll need to install a package at the appropriate level first
Related to #464320 (closed)