supabase / supabase / 27624141009

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refactor(studio): remove legacy homepage usage section (V1) (#46994)

## Problem

The homepage usage section had two implementations gated by the
`newHomepageUsageV2` ConfigCat flag, with the legacy V1 as the fallback.
That flag has been at 100% in production for months, so V1 is dead code
and the flag branch is unnecessary.

## Fix

- Make V2 the default by removing the `newHomepageUsageV2` flag check in
`Home.tsx`.
- Delete the V1 section (`Home/ProjectUsageSection.tsx`), its chart
(`Home/ProjectUsage.tsx`), and the now-orphaned
`project-log-requests-count-query` plus its query key.
- Shared code (`useProjectLogStatsQuery`, `UsageApiCounts`,
`ProjectLogStatsVariables`) is kept since V2 and other modules still use
it.

The `newHomepageUsageV2` flag can be removed from ConfigCat after this
merges.

## How to test

- Open a project homepage on platform.
- Confirm the usage section still renders (the V2 layout) with no flag
dependency.
- Verify no console errors and no broken imports.
- Expected result: identical homepage usage section to what production
shows today.

## Notes

- This is independent of the in-flight service-health usage charts work
(PR #46373), which is behind its own `newHomepageUsageDeltas` flag.
Whichever merges second will resolve a small conflict on the
`UsageSection` selection in `Home.tsx`.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Refactor**
  * Removed project usage statistics section from the home page.
* Simplified the home page experience by consolidating feature flag
variants into a standardized implementation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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