docs: clarify upstream lifecycle requests

[MikeMcQuaid]

• document that upstream requests or "broken" claims alone should not justify deprecating, disabling, or removing software
• point maintainers to Homebrew signals such as analytics and user reports before taking lifecycle actions
• keep the policy aligned across docs/How-to-Create-and-Maintain-a-Tap.md, docs/Homebrew-homebrew-core-Maintainer-Guide.md, and docs/Homebrew-homebrew-cask-Maintainer-Guide.md

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[Copilot]

Pull request overview

Clarifies Homebrew lifecycle policy that upstream requests (or unsubstantiated “broken” claims) alone shouldn’t drive deprecation/disable/removal decisions, and points maintainers toward Homebrew signals (analytics + user reports) before taking lifecycle actions.

Changes:

• Updated review dates across the three docs.
• Added explicit policy language in Tap documentation about upstream taps not being sufficient justification for lifecycle actions.
• Added parallel guidance to the core and cask maintainer guides to keep lifecycle decisions grounded in installs/user reports.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
docs/How-to-Create-and-Maintain-a-Tap.md	Adds upstream-request lifecycle guidance in the “Upstream taps” section; updates last_review_date.
docs/Homebrew-homebrew-core-Maintainer-Guide.md	Adds maintainer-facing lifecycle clarification for formulae; updates last_review_date.
docs/Homebrew-homebrew-cask-Maintainer-Guide.md	Adds a new lifecycle section for casks; updates last_review_date.

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