refactor(miniflare): centralize internal paths and move platform proxy endpoint

[edmundhung]

Fixes n/a.

This is just an internal refactor to centralize all our /cdn-cgi paths. No behavior changes.

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  • Documentation not necessary because: refactor only

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• packages/miniflare/src/index.ts: [@cloudflare/wrangler]
• packages/miniflare/src/plugins/core/constants.ts: [@cloudflare/wrangler]
• packages/miniflare/src/plugins/core/proxy/client.ts: [@cloudflare/wrangler]
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