Merge release 17.6 beta 4 into develop

[mokagio]

Includes:

• The newest stable version of Gutenberg mobile (Integrate gutenberg-mobile release 1.55.2 #16723)
• Two non users facing changes in the automation (Add automation to update App Store strings .po file for Jetpack #16706, Add ar-SA and he locales to screenshot generation #16707)

Nothing to test, if CI Shows green, we're good.

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.

---

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

[peril-wordpress-mobile]

You can trigger an installable build for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

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[mokagio]

Notice that, like in #16718, despite a version change for Gutenberg, there is no diff for Podfile and Podfile.lock because develop moved to a later version which takes precedence over the release branch one in the conflict resolution.