chore: Add themeable text color token for the key-value pairs value

[at-susie]

Description

Introduces a new themeable color token for the text color of values in the key-value pairs component.

The token defaults to colorTextBodyDefault, ensuring that it will create no visual changes for the existing instances.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.42%. Comparing base (742c992) to head (32f7172).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4537   +/-   ##
=======================================
  Coverage   97.42%   97.42%           
=======================================
  Files         938      938           
  Lines       29647    29647           
  Branches    10774    10774           
=======================================
  Hits        28884    28884           
  Misses        756      756           
  Partials        7        7           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.