[worker] Enable COCOAPODS_PARALLEL_CODE_SIGN for iOS builds

[sjchmiela]

Motivation

• Enable CocoaPods parallel code signing to speed up iOS builds (notably for projects with dynamic libraries) and keep worker and local build plugin environments consistent.

Description

• Set COCOAPODS_PARALLEL_CODE_SIGN=true in the worker iOS build environment (packages/worker/src/env.ts) and add the same variable to the local build plugin iOS env construction (packages/local-build-plugin/src/build.ts).

Testing

• Ran yarn workspace @expo/worker test, which failed in this environment due to missing module resolution for @expo/build-tools in the worker test setup.
• Ran yarn workspace eas-cli-local-build-plugin test, which succeeded (no tests found, exited 0).

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Codex Task

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.78%. Comparing base (f8deba7) to head (14e3838).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3441   +/-   ##
=======================================
  Coverage   52.78%   52.78%           
=======================================
  Files         809      809           
  Lines       34048    34048           
  Branches     7075     7075           
=======================================
  Hits        17969    17969           
  Misses      15998    15998           
  Partials       81       81           

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[hSATAC]

The code change is ok but I don’t have enough knowledge to determine if it’s a good idea to enable this globally. I believe it’s default to false for some reason.