Flaky messaging-integration-test

[paulb777]

Description

The messaging-integration-test has been failing about half the time lately.

I'm going to disable the test until the issue is resolved.

Revert #12206 when this is fixed

For example, see https://github.com/firebase/firebase-ios-sdk/actions/runs/7226772854/job/19693060191?pr=12204#step:9:1133:

Failing tests:
	FIRMessagingPubSubTest.testSubscribeTopic()
	FIRMessagingPubSubTest.testUnsubscribeTopic()
	FIRMessagingTokenRefreshTests.testDeleteDefaultTokenWithTokenRefreshDelegatesAndNotifications()

Reproducing the issue

See https://github.com/firebase/firebase-ios-sdk/blob/main/.github/workflows/messaging.yml#L26

Firebase SDK Version

10.19.0

Xcode Version

14.2

Installation Method

CocoaPods

Firebase Product(s)

Messaging

Targeted Platforms

iOS

Relevant Log Output

No response

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