[Workers] Document _redirects static/dynamic ordering behaviour

[MattieTK]

Summary

Documents the existing static/dynamic classification and ordering behaviour of the _redirects file, which is currently under-specified. The file previously stated only that "static redirects should appear before dynamic redirects" without explaining the consequences.

Clarifies that:

• A redirect is dynamic if its source contains a splat (*) or placeholder (:name); otherwise it is static.
• Redirects are counted as static only until the first dynamic redirect. After that, every remaining redirect — including exact-path ones — counts towards the 100 dynamic-redirect limit.
• If the dynamic limit is exceeded, the rest of the file is silently dropped from the deployment, including any catch-all at the end.

Prompted by a public report (https://x.com/samuelcolvin/status/2076993431818084700) where a large _redirects file lost everything after the dynamic-budget overflow with no build-time signal.

Related workers-sdk issue for a deploy-time warning and/or a compatibility-date-gated fix: cloudflare/workers-sdk#14694

This partial renders on both the Workers and Pages _redirects pages.

Documentation checklist

• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/partials/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @WalshyDev, @cloudflare/deploy-config, @cloudflare/product-owners, @cloudflare/wrangler, @MattieTK, @vy-ton, @cloudflare/workers-runtime-1

[github-actions]

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[github-actions]

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