Part of #18714: Replacing deprecated constants in approve-content-card folder

[rohiiittttt]

Explanation

• This PR is a part of Replace deprecated constants with enums #18714

Replaced deprecated design system and storybook constants in the approve-content-card folder
ui/components/app/approve-content-card

Screenshots/Screencaps

Before

After

Manual Testing Steps

Pre-merge author checklist

• I've clearly explained:
  • What problem this PR is solving
  • How this problem was solved
  • How reviewers can test my changes
• Sufficient automated test coverage has been added

Pre-merge reviewer checklist

• Manual testing (e.g. pull and build branch, run in browser, test code being changed)
• PR is linked to the appropriate GitHub issue
• IF this PR fixes a bug in the release milestone, add this PR to the release milestone

If further QA is required (e.g. new feature, complex testing steps, large refactor), add the Extension QA Board label.

In this case, a QA Engineer approval will be be required.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[georgewrmarshall]

LGTM! Just need tests to pass. I'll try remerging develop

[codecov]

Codecov Report

Merging #19448 (ebeb76d) into develop (5355000) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@             Coverage Diff             @@
##           develop   #19448      +/-   ##
===========================================
- Coverage    69.98%   69.98%   -0.01%     
===========================================
  Files          959      959              
  Lines        36790    36790              
  Branches      9452     9452              
===========================================
- Hits         25747    25745       -2     
- Misses       11043    11045       +2     

Impacted Files	Coverage Δ
...s/app/approve-content-card/approve-content-card.js	75.00% <50.00%> (ø)

... and 2 files with indirect coverage changes

[georgewrmarshall]

LGTM! Thanks for your contribution @rohiiittttt