MudText: Return subtitle1 and subtitle2 to block elements (p)

[danielchalmers]

Description

This was changed in #6061 to address accessibility and SEO concerns but broke backwards compatibility by making them inline spans instead of block elements. Most users were relying on this for the Align property (Fixes #8865). This returns them to block elements while not returning to headers.

In the future we should let the user decide which HTML tag they want to use: #8898.

How Has This Been Tested?

none

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.23%. Comparing base (28bc599) to head (6b0d7cc).
Report is 154 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8899      +/-   ##
==========================================
+ Coverage   89.82%   90.23%   +0.40%     
==========================================
  Files         412      424      +12     
  Lines       11878    12286     +408     
  Branches     2364     2406      +42     
==========================================
+ Hits        10670    11086     +416     
+ Misses        681      668      -13     
- Partials      527      532       +5     

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[henon]

Thanks