Remove experimental flag from serverActions.bodySizeLimit

[devjiwonchoi]

Since the Server Actions became stable, the following config for bodySizeLimit should also be removed from the experimental section.

This PR added the serverActions option to the next config for the current bodySizeLimit and further additions.
Also, modified text on docs from bytes to bits and MB to mb.

Extends #57145 #57433

[ijjk]

Allow CI Workflow Run

• approve CI run for commit: ccac12f

Note: this should only be enabled once the PR is ready to go and can only be enabled by a maintainer

[vercel-spaces]

Notifying the following users due to files changed in this PR based on this repo's notify modifiers:

@timneutkens, @ijjk, @shuding, @styfle, @huozhi:

packages/next/src/server/config.ts

[devjiwonchoi]

next.js/packages/next/src/server/app-render/action-handler.ts

Line 425 in ccac12f

serverActionsBodySizeLimit ?? '1mb'

[devjiwonchoi]

Seems like #57529 is adding more options, need to resolve any conflicts if needed.

[huozhi]

@devjiwonchoi Thanks for the PR, we still plan it as experimental flags, we removed serverActions: boolean flag but others could possibly changed as they're mainly related to deployment. Will tackle them later once those flags can move to stable

[devjiwonchoi]

@huozhi I just wanna know that this:

module.exports = {
  experimental: {
    serverActions: {
      bodySizeLimit: '1mb',
    },
  },
}

is resulting console as:

 ⚠ Invalid next.config.js options detected: 
 ⚠     Unrecognized key(s) in object: 'serverActions' at "experimental"
 ⚠ See more info here: https://nextjs.org/docs/messages/invalid-next-config
 ⚠ Server Actions are available by default now, `experimental.serverActions` option can be safely removed.

and does it not need any modification at the moment?

[huozhi]

@devjiwonchoi that sounds like an issue for configuration validation, thanks for reporting, we'll take a look on that!

[shuding]

Want to also add that even if Server Actions are considered stable, some options to tweak its behavior might still remain experimental (such as the body size thing). Mostly because they were introduced as a work around to certain issues that might be fixed in a different way in the future.