fix: input: updates validation status font color to latest specification

[dkilgore-eightfold]

SUMMARY:

• Updates the default text validation status input font colors to --text-primary-color so they are consistent with invalidated state, deferring visual cue to its border and inline validation text

JIRA TASK (Eightfold Employees Only):

ENG-65381

CHANGE TYPE:

• Bugfix Pull Request
• Feature Pull Request

TEST COVERAGE:

• Tests for this change already exist
• I have added unittests for this change

TEST PLAN:

Pull the PR branch and run yarn and yarn storybook. Verify the Form stories behave as expected.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (268b54f) 84.86% compared to head (9354c22) 84.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #771      +/-   ##
==========================================
- Coverage   84.86%   84.85%   -0.01%     
==========================================
  Files         999      999              
  Lines       19411    19411              
  Branches     7224     7224              
==========================================
- Hits        16473    16472       -1     
- Misses       2856     2857       +1     
  Partials       82       82              

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