Scope the User Interface Test Build to Its Own Derived Data

[PSchmiedmayer]

♻️ Current situation & Problem

The user interface test build writes to the shared derived data directory of the machine it runs on, which every other run on that self-hosted runner writes to as well. When two runs overlap, or when one is cancelled part way through a build, the next run reads a precompiled module that no longer matches the module map it was built from, and the build fails before compiling anything of ours:

error: file '.../DerivedData/MyHeartCounts-<hash>/Build/Products/Debug-iphonesimulator/FirebaseFirestoreInternal.framework/Modules/module.modulemap'
has been modified since the module file '.../SwiftExplicitPrecompiledModules/FirebaseFirestoreInternalWrapper-....pcm' was built
** TEST BUILD FAILED **

This is the only build in this repository that does not name a derived data path, so it is the only one exposed to it. It happened on the deployment run for the previous change, and re-running the same commit with no edit at all succeeded, which is the signature of a shared cache rather than anything in the project.

The same file also carries a job that was commented out when the user interface tests moved to the sharded build and run they use today. It has been dead since.

No related issue was identified.

⚙️ Release Notes

• Give the user interface test build its own derived data directory, so concurrent and cancelled runs on the same machine can no longer leave a cache behind that fails the next one.
• Remove the superseded user interface test job.

📚 Documentation

No documentation changes are required.

✅ Testing

• The build the change touches is the one that produced the failure above, and it runs on every pull request, including this one
• actionlint

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