feat: Add yellow value to status indicator colorOverride prop

[jperals]

Description

Fixes #1643.

Since warning yellow was added to the system in #1340, it only makes sense that this color can be used as color override for status indicators.

How has this been tested?

• Added permutation to existing permutations page, verified the result visually
• Verified that the BackstopJS failures are as expected

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?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a86eadc) 94.20% compared to head (37a4fb1) 94.20%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1682   +/-   ##
=======================================
  Coverage   94.20%   94.20%           
=======================================
  Files         650      650           
  Lines       17539    17539           
  Branches     5776     5776           
=======================================
  Hits        16522    16522           
  Misses        948      948           
  Partials       69       69           

Files	Coverage Δ
src/status-indicator/internal.tsx	100.00% <ø> (ø)

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