Part of #18714: Replacing deprecated constants and components

[dhruvv173]

Explanation

• This PR is a part of Replace deprecated constants with enums #18714
• Replace deprecated Box component with new Box component #19526
• Replace deprecated Typography with Text component #17670

ui/components/app/signature-request-original/signature-request-original-warning

Screenshots/Screencaps

After

unit test coverage

Manual Testing Steps

• Check controls for SignatureRequestOriginalWarning on this branch

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.

[codecov]

Codecov Report

Merging #20070 (bc45641) into develop (1277c62) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #20070      +/-   ##
===========================================
- Coverage    69.42%   69.42%   -0.01%     
===========================================
  Files          990      990              
  Lines        37418    37418              
  Branches     10039    10039              
===========================================
- Hits         25976    25974       -2     
- Misses       11442    11444       +2     

Impacted Files	Coverage Δ
...inal-warning/signature-request-original-warning.js	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

[georgewrmarshall]

LGTM!