Updated files and documentation for iOS 18 support.

[ShadowBearVR]

Added ios_test_runner to all unit tests, and updated the documentation to provide debugging steps if tests fail due to a device/version mismatch.

[mattrobmattrob]

Thanks for the contribution, @ShadowBearVR!

I'll work on making the default iOS sim device finding a little more robust in this template repo so that we don't have to define (a) more than one test runner or (b, the ideal) no custom test runner. We'll see if it takes some work in bazelbuild/rules_apple or not.

[ShadowBearVR]

Thanks for the quick reply. That sounds great to me. I am seeing some test failures due to a missing API key - I am assuming that is unrelated to my changes?

[mattrobmattrob]

Thanks for the quick reply. That sounds great to me. I am seeing some test failures due to a missing API key - I am assuming that is unrelated to my changes?

Yeah, problem with external contributors and how this repo is setup. Trying to figure that out as well.

[mattrobmattrob]

Mostly trying to make sure you get commit credit for the contribution! Mind adding the following at the bottom of tools/shared.bzl to see if it works for you then commit and push to this PR if it does? Works for me locally with Xcode 16.2 as my chosen version.

default_test_runner = Label("@build_bazel_rules_apple//apple/testing/default_runner:ios_xctestrun_random_runner")

[ShadowBearVR]

That worked for me!

[mattrobmattrob]

Great. Now let's see if I can get my convoluted CI setup to pass.