[eas-cli] Add flag to emit build meta

[rainst]

Why

Currently Bugsnag doesn't support automatic source map upload after running eas update so I made a script that makes a manual submission after bundling and submitting an update. The script is relying on eas-update-metadata.json to obtain the bundle ids.

I am currently using [email protected] and the update script is working well, but I have realised that this feature was removed with the v7 release thus preventing me from updating to a newer version of eas-cli.

How

This feature was introduced in #2158 and removed in #2187, so I have reverted the changes and put the feature behind the --emit-build-meta --emit-metadata flag rather than having it aways on so nothing will change for people that don't really need it.

Test Plan

I have tested with my update pipeline script and it works as expected.

• Run eas update --emit-metadata and in the dist folder there should be eas-update-metadata.json with the following shape:

{
  "updates": [
    {
      "id": "f3021b72-f530-4ce6-94eb-4441b0bb237f",
      "createdAt": "2024-07-08T06:07:00.573Z",
      "group": "f889ce3d-3a8e-4415-98f5-23232",
      "branch": "main",
      "message": "test",
      "runtimeVersion": "1.23.1",
      "platform": "android",
      "manifestPermalink": "https://u.expo.dev/update/f3021b72-f530-4ce6-94eb-4441b0bb237f",
      "isRollBackToEmbedded": false,
      "gitCommitHash": "00e36199b3c15ad2df049f9f5d9a03bc32dfeb03"
    },
    {
      "id": "a1f730fa-cac2-4a08-b157-b44415af3c724",
      "createdAt": "2024-07-08T06:07:00.573Z",
      "group": "f889ce3d-3a8e-4415-98f5-f3232395fc725",
      "branch": "main",
      "message": "test",
      "runtimeVersion": "1.23.1",
      "platform": "ios",
      "manifestPermalink": "https://u.expo.dev/update/a1f730fa-cac2-4a08-b157-b44415af3c724",
      "isRollBackToEmbedded": false,
      "gitCommitHash": "00e36199b3c15ad2df049f9f5d9a03bc32dfeb03"
    }
  ]
}

• The file should not be emitted when running eas update without the --emit-metadata flag
• When the --skip-bundler flag is set a warning will notify the user that --emit-metadata will be ignored because not applicable

[wschurman]

Just a few changes (noted inline). Main one is to remove the term "build" from this since, in the context of EAS CLI, "build" means something very different (EAS build).

I'm definitely all for re-adding this back in though.

[rainst]

@wschurman I have applied all the suggested changes, please let me know if I missed anything

[wschurman]

Couple more changes, otherwise looks good. I'll merge after the changes are made.

[quinlanj]

lgtm. happy to add this feature back behind a flag :)

[rainst]

@wschurman I have committed your changes and replaced all the occurrences of the old variable with the new one. There shouldn't be any build mention left now :)

Thank you @quinlanj for reviewing!