Replaces ConstraintLayout with RelativeLayout to bypass RTL rendering issue

[antonis]

Fixes #14438

Description

The original my_site_item_block.xml structure worked as expected in LTR languages and there is no structural reason to break in RTL. Thus the observed UI bug is most probably due to a ConstraintLayout bug (e.g.).
Note that we are using version 1.1.3 of ContraintLayout. I tested with 2.0.4(stable) and 2.1.0-beta1 and the issue is still reproduced.
As a workaround the layout was transformed to RelativeLayout.
A fix using ConstraintLayout was cherrypicked from @planarvoid's solution 4a51f62

To test:

1. Set the Interface to an RTL (e.g. Hebrew or Arabic) language (Avatar>App Settings> Interface Language)
2. Browse to My Site screen
3. Verify that the options list is rendered correctly

Hebrew Before	Hebrew with the Fix

Arabic	English

Regression Notes

1. Potential unintended areas of impact
   None identified

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 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]

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

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APK here.

[chipsnyder]

Works as described and LGTM! 🚢