overwrite redirect SSG meta.status to 200 for RSC requests (#80391)
For a static route that simply returns a `redirect`:
```
export default function Page() {
redirect("/about");
}
```
the SSG generates a `.meta` file for the route at build time, that looks
like:
```
{
"status": 307,
"headers": {
"location": "/about"
}
}
```
On `next start`, if a request matches this route, the status code is
retrieved from the file and returned to the response. This is perfectly
fine for DOC requests. However, if the request is an RSC request, its
RSC payload should have already encoded the redirect instruction:
```
1:"$Sreact.fragment"
2:I[657,[],""]
3:I[8597,[],""]
5:I[5975,[],"OutletBoundary"]
8:I[4429,[],"AsyncMetadataOutlet"]
a:I[5975,[],"ViewportBoundary"]
c:I[5975,[],"MetadataBoundary"]
e:I[1363,[],""]
0:{"P":null,"b":"gelhztYnmFGzccJ4F6F4T","p":"","c":["","rsc-redirect"],"i":false,"f":[[["",{"children":["rsc-redirect",{"children":["__PAGE__",{}]}]},"$undefined","$undefined",true],["",["$","$1","c",{"children":[null,["$","html",null,{"lang":"en","children":["$","body",null,{"children":["$","$L2",null,{"parallelRouterKey":"children","error":"$undefined","errorStyles":"$undefined","errorScripts":"$undefined","template":["$","$L3",null,{}],"templateStyles":"$undefined","templateScripts":"$undefined","notFound":[[["$","title",null,{"children":"404: This page could not be found."}],["$","div",null,{"style":{"fontFamily":"system-ui,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif,\"Apple Color Emoji\",\"Segoe UI Emoji\"","height":"100vh","textAlign":"center","display":"flex","flexDirection":"column","alignItems":"center","justifyContent":"center"},"children":["$","div",null,{"children":[["$","style",null,{"dangerouslySetInnerHTML":{"__html":"body{color:#000;background:#fff;margin:0}.next-error-h1{border-right:1px solid rgba(0,0,0,.3)}@media (prefers-color-scheme:dark){body{color:#fff;background:#000}.next-error-h1{border-right:1px solid rgba(255,255,255,.3)}}"}}],["$","h1",null,{"className":"next-error-h1","style":{"display":"inline-block","margin":"0 20px 0 0","padding":"0 23px 0 0","fontSize":24,"fontWeight":500,"verticalAlign":"top","lineHeight":"49px"},"children":404}],["$","div",null,{"style":{"display":"inline-block"},"children":["$","h2",null,{"style":{"fontSize":14,"fontWeight":400,"lineHeight":"49px","margin":0},"children":"This page could not be found."}]}]]}]}]],[]],"forbidden":"$undefined","unauthorized":"$undefined"}]}]}]]}],{"children":["rsc-redirect",["$","$1","c",{"children":[null,["$","$L2",null,{"parallelRouterKey":"children","error":"$undefined","errorStyles":"$undefined","errorScripts":"$undefined","template":["$","$L3",null,{}],"templateStyles":"$undefined","templateScripts":"$undefined","notFound":"$undefined","forbidden":"$undefined","unauthorized":"$undefined"}]]}],{"children":["__PAGE__",["$","$1","c",{"children":["$L4",null,["$","$L5",null,{"children":["$L6","$L7",["$","$L8",null,{"promise":"$@9"}]]}]]}],{},null,false]},null,false]},null,false],["$","$1","h",{"children":[null,["$","$1","0db7ba866b0656c433aa56ad545d5b104626108ev",{"children":[["$","$La",null,{"children":"$Lb"}],null]}],["$","$Lc",null,{"children":"$Ld"}]]}],false]],"m":"$undefined","G":["$e","$undefined"],"s":false,"S":true}
4:E{"digest":"NEXT_REDIRECT;replace;/about;307;"}
f:"$Sreact.suspense"
10:I[4429,[],"AsyncMetadata"]
d:["$","div",null,{"hidden":true,"children":["$","$f",null,{"fallback":null,"children":["$","$L10",null,{"promise":"$@11"}]}]}]
7:null
b:[["$","meta","0",{"charSet":"utf-8"}],["$","meta","1",{"name":"viewport","content":"width=device-width, initial-scale=1"}]]
6:null
9:{"metadata":[],"error":null,"digest":"$undefined"}
11:{"metadata":"$9:metadata","error":null,"digest":"$undefined"}
```
Specifically,
```
4:E{"digest":"NEXT_REDIRECT;replace;/about;307;"}
```
Hence, it would be fine to simply return 200 status code.
There are two motivations for this change:
1. This new behaviour is consistent with Next.js apps hosted on Vercel.
(I.e., it returns 200 for static RSC even if the `meta.status = 307`)
2. 307 redirect on RSC payload is an obstacle to enabling [RSC
validation](https://github.com/vercel/next.js/pull/80157)
next.js
d49c6a40 - overwrite redirect SSG meta.status to 200 for RSC requests (#80391)
