Fixes a couple of flaky unit and UI tests

[hassaanelgarem]

Description

This PR fixes a couple of flaky unit and UI tests.
Tests targeted are the least reliable tests based on Buildkite's test analytics.

Targeted tests:

• MediaURLExporterTests.testThatURLExportingVideoWorks
• MediaURLExporterTests.testThatURLExportingVideoWithoutGPSWorks
• EditorGutenbergTests.testAddGalleryBlock

Testing Instructions

No need for testing. If the CI passes, then we're good to go

Regression Notes

1. Potential unintended areas of impact
   N/A

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   N/A

3. What automated tests I added (or what prevented me from doing so)
   N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

Generated by 🚫 dangerJS

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr19750-a7fa7d6 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr19750-a7fa7d6 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[jostnes]

Thanks for looking at making UI tests more reliable @hassaanelgarem ! I'm not too sure which tests this is looking to fix exactly but from the list here and the changes made, I'm thinking it's testAddGalleryBlock but please let me know if that's not it.

I have one comment but other than that it should be good!

[hassaanelgarem]

I'm not too sure which tests this is looking to fix exactly but from the list here and the changes made, I'm thinking it's testAddGalleryBlock but please let me know if that's not it.

@jostnes Yeah sorry about that. You're correct. I've updated the PR description with the targeted tests 👍

[jostnes]

thanks for updating the description, the test looks good!