[API Shield] Update API Discovery operation workflow

[xmflszz]

Summary

• Replaces the obsolete API Discovery inbox, save, and ignore workflow.
• Explains how Web Assets represents discovered endpoints as candidate operations.
• Documents promotion to the full state through Learn profile.

Testing

• pnpm exec prettier --check src/content/docs/api-shield/security/api-discovery.mdx
• pnpm run check
• pnpm run build
• git diff --check

Screenshots (optional)

Not applicable. This PR updates documentation content only.

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit d4deeaf.

Code Review

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Conventions

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Style Guide Review

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