GT-2482 add fixed padding to mobile content renderer paragraph elements

[levieggertcru]

This PR makes an adjustment to the mobile content renderer elements by applying a fixed top and bottom padding of 8 points to paragraph elements.

I removed the item spacing configuration on vertical stacks which applies spacing between direct child elements in the stack. Instead item spacing between child elements will remain at 0.

These changes are made to mimic Android.

The vertical stack item spacing change applied to the following elements and there may need to be some tweaks on these for this PR change:

• Tract Page
• Tract Card
• Training Page
• Content
• Accordion Section
• Card Collection Page Card
• Lesson Page
• Multi Select
• Tab
• Form
• CYOA Intro Page
• CYOA Categories Page

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.94%. Comparing base (2789a2e) to head (a2060b7).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2388      +/-   ##
===========================================
+ Coverage    95.92%   95.94%   +0.01%     
===========================================
  Files           62       62              
  Lines         5323     5323              
===========================================
+ Hits          5106     5107       +1     
+ Misses         217      216       -1     

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[levieggertcru]

NOTE: There will most likely need to be some tweaks to the renderer following this PR. Need to take a closer look at these elements in the renderer and see how this change effects these areas:

Tract Page
Tract Card
Training Page
Content
Accordion Section
Card Collection Page Card
Lesson Page
Multi Select
Tab
Form
CYOA Intro Page
CYOA Categories Page