feat: add accountId flags const (#5797)

* feat: add accountId flags const

* fix: update snapshot

---------

Co-authored-by: Netlify Bot <[email protected]>

Author: lemusthelroy

packages/build/src/core/flags.js

@@ -62,6 +62,10 @@ The NETLIFY_AUTH_TOKEN environment variable can be used as well.`,
     string: true,
     describe: `Netlify Site ID.`,
   },
+  accountId: {
+    string: true,
+    describe: `Netlify Account ID.`,
+  },
   deployId: {
     string: true,
     describe: `Netlify Deploy ID.

packages/build/tests/core/snapshots/tests.js.md

@@ -39,6 +39,7 @@ Generated by [AVA](https://avajs.dev).
                         The NETLIFY_AUTH_TOKEN␊
                          environment variable can be used as well.          [string]␊
       --siteId          Netlify Site ID.                                    [string]␊
+      --accountId       Netlify Account ID.                                 [string]␊
       --deployId        Netlify Deploy ID.␊
                         Default: automatically guessed                      [string]␊
       --buildId         Netlify Build ID.␊