DOCS-1837 - Add redirects for August GA4 404 report

[JV0812]

Purpose of this pull request

Adds 91 redirects to cid-redirects.json for the August GA4 "Pages and Screens" 404 report (https://sumologic.atlassian.net/browse/DOCS-1837), covering:

• 10 legacy MindTouch wiki paths with confirmed current-doc equivalents.
• 44 current-site (/docs/...) paths — renamed pages, moved sections, trailing-slash/typo variants — with confirmed current-doc equivalents.
• 37 entries for a "threat forecasting" URL-guessing cluster: ~28 distinct 404s all guessed at a "threat forecasting" API/feature under every plausible path permutation. Verified this feature doesn't exist anywhere in the repo, in sidebars, or in any public Sumo Logic material — routed to the closest real content based on path context: /docs/api/cloud-siem-enterprise (API-shaped guesses), /docs/security/threat-intelligence/about-threat-intelligence (conceptual guesses), /docs/api/threat-intel-ingest (one intel-ingest-specific guess), and /docs/api/cloud-soar (the one automation-service-flavored guess).

Explicitly excluded (documented in the ticket, not silently dropped):

• Image/asset 404s (/help/@api/deki/files/..., /help/img/...) — plugin-client-redirects only redirects page routes, not assets.
• ~65 stale hits already fixed by prior redirect PRs (Add redirects for broken links found in GA4 404 report #7044, DOCS-1812 - Add cid-redirects entries for GA 404 broken links #7018, Add 65 CID redirects for Google Analytics 404s #6995, Fix GA 404s with 85 new CID redirects #6885, Fix top-100 GA 404s with new CID redirects #6880) — report window overlaps their merge dates.
• GA4 export truncation artifacts and bot/scanner noise.
• A handful of paths with no confident current equivalent, or a scope mismatch (e.g., a generic "GitHub source" guess where only a GitHub Copilot-specific source doc exists).

Every redirect target was verified to resolve to a real, currently-published doc via a full yarn build (which also caught and fixed 3 bad entries along the way: two mismatched id:-vs-filename cases and a duplicate trailing-slash self-redirect).

Select the type of change

• Minor Changes - Typos, formatting, slight revisions
• Update Content - Revisions, updating sections
• New Content - New features, sections, pages, tutorials
• Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

https://sumologic.atlassian.net/browse/DOCS-1837