Typography: Make FontWeight and LineHeight strings

[danielchalmers]

Description

Resolves #9011 by making FontWeight and LineHeight of type string?.

Final CSS has not changed as evidenced by the passing tests. This should only require surrounding the previous values in double quotes to migrate to this new setup.

How Has This Been Tested?

unit

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 90.55%. Comparing base (28bc599) to head (dd36f32).
Report is 530 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9592      +/-   ##
==========================================
+ Coverage   89.82%   90.55%   +0.72%     
==========================================
  Files         412      406       -6     
  Lines       11878    12751     +873     
  Branches     2364     2472     +108     
==========================================
+ Hits        10670    11547     +877     
+ Misses        681      642      -39     
- Partials      527      562      +35     

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[ScarletKuro]

Added to v8.0.0 Migration Guide #9953