[eas-cli] allow running eas/build function group with credentials for iOS GH builds

[szdziedzic]

Why

We are making a decision in our system whether to execute the credentials or without the credentials flow for the iOS eas/build function group based on the presence of job.secrets.buildCredentials. However, at the time of making this discussion (before the build starts), these are always missing for GH builds and are only resolved later.

We should rely on job.simulator only instead, which is always correctly set for GH builds https://github.com/expo/universe/blob/9eccb36e30da89e17d1c8b748437da99faebfa7d/server/www/src/data/entities/github/GitHubBuildUtils.ts#L165

How

Only use job.simulator to decide which flow to enter

Test Plan

Test it manually

[szdziedzic]

• [eas-cli] allow running eas/build function group with credentials for iOS GH builds #480 👈 (View in Graphite)
• main

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