Update Gallery test to use the updated closeMediaPicker util

[geriux]

Related PRs

• [Mobile] Appium 2 Migration #6276
• [Mobile] Appium 2 Migration WordPress/gutenberg#55166
• Part of [Mobile] - Update closePicker util and updates Image Block test data WordPress/gutenberg#55484

What?

This PR updates the Gallery visual test.

Why?

To use the new name for the closePicker util that is now changed to closeMediaPicker.

How?

• Replaces closePicker to closeMediaPicker

Testing Instructions

Canary tests should succeed in CI.

Local tests should pass by running the following command for both platforms:

Android

 TEST_RN_PLATFORM=android npm run device-tests:local gutenberg-editor-media-blocks-@canary.test

iOS

 TEST_RN_PLATFORM=ios npm run device-tests:local gutenberg-editor-media-blocks-@canary.test

I've also confirmed it runs on SauceLabs by triggering the test from a local command against the Appium 2 build

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[dcalhoun]

Test plan succeeded. 🚀