Use internal JSON for update reports

[MikeMcQuaid]

• Reuse package data already fetched by brew update
• Avoid public bulk JSON downloads for package descriptions

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Codex GPT 5.6 Sol xhigh with local review and testing.

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[Copilot]

Pull request overview

This PR updates brew update’s reporting to pull formula/cask descriptions from the internal packages JSON that brew update already fetches, avoiding reliance on the public bulk JSON endpoints for descriptions.

Changes:

• Switch update-report description lookups from public formula.jws.json/cask.jws.json data to Homebrew::API::Internal per-package hashes.
• Remove ReporterHub’s now-unneeded memoized “all JSON” fetch helpers.
• Update unit tests to stub internal-API lookups and guard against unexpected public JSON API access.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Library/Homebrew/cmd/update_report/reporter_hub.rb	Replaces public bulk JSON description lookups with internal packages hash lookups; removes bulk JSON helper methods.
Library/Homebrew/test/cmd/update-report_spec.rb	Adjusts specs to stub Homebrew::API::Internal description sources and prevent unexpected public API fetches.

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