Split prototype build into separate build and upload steps

[Copilot]

Splits the prototype build process into independent build and upload steps, enabling artifact reuse and independent retry of upload failures without rebuilding. Follows the pattern established in Pocket Casts iOS.

Changes

Fastlane

• Added build_for_prototype_build lane: builds enterprise IPA to artifacts/
• Added upload_prototype_build lane: uploads IPA and dSYM to Firebase/Sentry
• Kept build_and_upload_prototype_build for backward compatibility (calls both lanes)

Buildkite Pipeline

• PR builds: Automated two-step process (build → upload) with artifact passing
• Trunk builds: Manual approval gate, then build → upload steps
• Build step artifacts: artifacts/*.ipa, artifacts/*.app.dSYM.zip
• Upload step depends on build completion and retrieves artifacts

Scripts

• prototype-build.sh: calls build_for_prototype_build only
• prototype-upload.sh: new script calling upload_prototype_build

Differences from Pocket Casts iOS

PR builds run automatically without manual approval (trunk builds still require approval).

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Split building from uploading the Prototype Build</issue_title>
<issue_description>Update the local automation and how it is called in Buildkite to split building the Prototype Build for Enterprise distribution via Firebase from uploading it to Firebase.

Use Pocket Casts iOS as a reference. In particular:

• https://github.com/Automattic/pocket-casts-ios/blob/6e83124130c4007079592184a43af1f9c234a820/fastlane/Fastfile#L667-L738
• https://github.com/Automattic/pocket-casts-ios/blob/6e83124130c4007079592184a43af1f9c234a820/.buildkite/pipeline.yml#L47-L76

Unlike Pocket Casts iOS, however, prototype builds from PRs on this project do not require user input to begin; they should run on every build triggered from a PR.

See also https://linear.app/a8c/issue/AINFRA-1624/split-prototype-build-build-from-upload-via-dedicated-ci-steps-in</issue_description>

Comments on the Issue (you are @copilot in this section)

@dangermattic Thanks for reporting! 👍 @mokagio Created this to see how Copilot will cope with it. But waiting for #16432 to be merged before assigning it.

• Fixes Split building from uploading the Prototype Build #16433

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[dangermattic]

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