🏗♻️ Allow rewriting `.mjs` CDN files on local mode (#34741)
🏗♻️ Allow rewriting `.mjs` CDN files on local mode (#34741)

Cached pages use `.mjs`. Matching it locally allows us to use the **Load by URL Proxy**.
danielrozenberg/amphtml,ampproject/amphtml,rsimha-amp/amphtml,mhc-gh/amphtml,honeybadgerdontcare/amphtml,honeybadgerdontcare/amphtml,smartadserver/amphtml,danielrozenberg/amphtml,media-net/amphtml,smartadserver/amphtml,alanorozco/amphtml,Gregable/amphtml,honeybadgerdontcare/amphtml,jridgewell/amphtml,honeybadgerdontcare/amphtml,ampproject/amphtml,jpettitt/amphtml,alanorozco/amphtml,alanorozco/amphtml,danielrozenberg/amphtml,media-net/amphtml,honeybadgerdontcare/amphtml,ampproject/amphtml,ampproject/amphtml,jridgewell/amphtml,danielrozenberg/amphtml,danielrozenberg/amphtml,jpettitt/amphtml,jpettitt/amphtml,alanorozco/amphtml,alanorozco/amphtml,rsimha-amp/amphtml,jridgewell/amphtml,alanorozco/amphtml,media-net/amphtml,mhc-gh/amphtml,media-net/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,rsimha-amp/amphtml,honeybadgerdontcare/amphtml,jridgewell/amphtml,smartadserver/amphtml,media-net/amphtml,Gregable/amphtml,danielrozenberg/amphtml,Gregable/amphtml,media-net/amphtml,honeybadgerdontcare/amphtml,smartadserver/amphtml,rsimha-amp/amphtml,mhc-gh/amphtml,rsimha-amp/amphtml,smartadserver/amphtml,Gregable/amphtml,ampproject/amphtml,alanorozco/amphtml,ampproject/amphtml,mhc-gh/amphtml,mhc-gh/amphtml,jpettitt/amphtml,Gregable/amphtml,Gregable/amphtml,media-net/amphtml,jpettitt/amphtml,Gregable/amphtml,media-net/amphtml,mhc-gh/amphtml,ampproject/amphtml,smartadserver/amphtml,jpettitt/amphtml,mhc-gh/amphtml,jridgewell/amphtml,Gregable/amphtml,alanorozco/amphtml,jridgewell/amphtml,jpettitt/amphtml,jpettitt/amphtml,jridgewell/amphtml,rsimha-amp/amphtml,ampproject/amphtml,danielrozenberg/amphtml,danielrozenberg/amphtml