[Bug]: Statuscode from getPageData is not applied

Summary

export async function getServerData() {
  return {
    status: 404,
    props: {},
  }
}

when my getServerData fn on a ssr route returns a 404 status (or any other statuscode) netlify will always send a 200 statuscode since this is hardcoded (which can be seen here). when data.serverDataStatus yields a 404 or 500 we should return the getErrorResponse fn instead

Steps to reproduce

create a gatsby project with an ssr route and add

export async function getServerData() {
  return {
    status: 404,
    props: {},
  }
}

deploy it to netlify (or serve with netlify locally)
call the ssr-route in the browser an see the statuscode send from netlify (it will be a 200)

! serving with gatsby (gatsby serve) wont work since here it works correctly)

A link to a reproduction repository

No response

Plugin version

3.8.0

More information about your build

[X] I am building using the CLI
[X] I am building using file-based configuration (netlify.toml)

What OS are you using?

Mac OS

Your netlify.toml file

`netlify.toml`

```toml [build] ignore = "exit 0" functions = "./netlify/functions" publish = "public/" [build.environment] NODE_OPTIONS = "--max_old_space_size=8192" [[plugins]] package = "@netlify/plugin-gatsby" [[headers]] for = "*" [headers.values] cache-control = """ max-age=0, no-cache, no-store, must-revalidate""" [[headers]] for = "*.json" [headers.values] cache-control = """ private, no-cache, no-store""" [[headers]] for = "*.js" [headers.values] cache-control = """ public, max-age=172800, must-revalidate""" ```

Configuration

`gatsby-config.js` and options

``` # Paste content of your `gatsby-config.js` file, and/or command line options here. Check there is no private info in there. ```

Environment

``` System: OS: macOS 13.3 CPU: (10) arm64 Apple M1 Max Memory: 2.88 GB / 64.00 GB Shell: 5.9 - /bin/zsh Binaries: Node: 18.11.0 - ~/.nvm/versions/node/v18.11.0/bin/node Yarn: 1.22.19 - ~/.nvm/versions/node/v18.11.0/bin/yarn npm: 8.19.2 - ~/.nvm/versions/node/v18.11.0/bin/npm Browsers: Brave Browser: 114.1.52.130 Chrome: 122.0.6261.94 Safari: 16.4 ```

Gatsby info

gatsby info

``` System: OS: macOS 13.3 CPU: (10) arm64 Apple M1 Max Shell: 5.9 - /bin/zsh Binaries: Node: 18.11.0 - ~/.nvm/versions/node/v18.11.0/bin/node Yarn: 1.22.19 - ~/.nvm/versions/node/v18.11.0/bin/yarn npm: 8.19.2 - ~/.nvm/versions/node/v18.11.0/bin/npm Languages: Python: 2.7.18 - /Users/.../.pyenv/shims/python Browsers: Chrome: 122.0.6261.94 Firefox: 120.0.1 Safari: 16.4 npmPackages: gatsby: ^5.10.0 => 5.11.0 gatsby-plugin-eslint: ^4.0.4 => 4.0.4 gatsby-plugin-google-tagmanager: ^5.10.0 => 5.11.0 gatsby-plugin-graphql-codegen: ^3.1.1 => 3.1.1 gatsby-plugin-manifest: ^5.10.0 => 5.11.0 gatsby-plugin-netlify: ^5.1.0 => 5.1.0 gatsby-plugin-react-helmet: ^6.10.0 => 6.11.0 gatsby-plugin-react-svg: ^3.3.0 => 3.3.0 gatsby-plugin-resolve-src: ^2.1.0 => 2.1.0 gatsby-plugin-sitemap: ^6.10.0 => 6.11.0 gatsby-plugin-typescript: ^5.10.0 => 5.11.0 npmGlobalPackages: gatsby-cli: 5.10.0 ```

Your _redirects file

`_redirects`

```toml # Paste content of your `_redirects` file here ```

Builds logs (or link to your logs)

Build logs

``` # Paste logs here ```

Function logs

``` # Paste logs here ```

netlify / netlify-plugin-gatsby