FIAM `tests` workflow job has UI tests that flake on CI

[ncooke3]

Description

Disabled in #14758 to make nightlies less noisy

Reproducing the issue

No response

Firebase SDK Version

11.12

Xcode Version

16.2

Installation Method

Swift Package Manager

Firebase Product(s)

In-App Messaging

Targeted Platforms

iOS

Relevant Log Output

If using Swift Package Manager, the project's Package.resolved

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If using CocoaPods, the project's Podfile.lock

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