feat(Discover EOL): Updating docs to remove Discover pages and add Explore > Errors

[sfanahata]

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Summary

Sentry is removing the Discover feature set. The errors tab from Discover is moving to Explore > Errors (same functionality, new location), and the transactions tab is being removed entirely (already deprecated in favor of Trace Explorer).

Changes

New page: /product/errors/

• Created docs/product/errors/index.mdx with sidebar_order: 201 (appears right after Traces and Spans, before Logs in the Explore/Debug nav section)
• Content adapted from the old Discover pages, covering: search/filtering, interactive graph, table columns and stacking functions, saved/pre-built queries, and the "Uncovering Trends" error query examples
• All transaction/performance content excluded (no transactions dataset, no transaction-specific functions, no query equations)
• No screenshots or arcades carried over — these will need to be recreated for the new UI

Deleted: /product/discover-queries/

• Removed all Discover pages (index.mdx, query-builder.mdx, uncover-trends.mdx, query-builder/query-equations.mdx, standard-fields.json) and associated images

Updated internal references (12 files)

• All links pointing to /product/discover-queries/ now point to /product/errors/
• Transaction-specific references (e.g., "Open in Discover" on the Transaction Summary page) updated to point to Trace Explorer instead
• Updated CODEOWNERS and docs-changelog

Redirects

• redirects.js: Added redirects from /product/discover-queries and /product/discover-queries/:path* to /product/errors/
• middleware.ts: Updated all 9 legacy discover redirect destinations to /product/errors/; added new /product/discover-queries/ redirect

Main preview page: https://sentry-docs-git-sfanahata-featdiscover-to-errors-explore.sentry.dev/product/errors/

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• Urgent deadline (GA date, etc.):
• Other deadline: July 23
• None: Not urgent, can wait up to 1 week+

SLA

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• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

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• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

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