Disable testPagesCardHeaderNavigation for fixing.

[tiagomar]

Description

This PR disables testPagesCardHeaderNavigation() to reduce the noise while working on a proper fix.

Testing

CI must be 🟢.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr21379-ad9ab94
	Version	23.0
	Bundle ID	com.jetpack.alpha
	Commit	ad9ab94
	App Center Build	jetpack-installable-builds #5819

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[pachlava]

For this kind of change, no deep review is needed. The fact of not seeing testPagesCardHeaderNavigation executed on CI (which is the case) is enough for 🚢. Thanks, @tiagomar!

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr21379-ad9ab94
	Version	23.0
	Bundle ID	org.wordpress.alpha
	Commit	ad9ab94
	App Center Build	WPiOS - One-Offs #6779

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.