[Storefront] Marketplace Row titles & Dressing room titles are no longer WCAG compliant

• Partner Rank: N/A
• Partner Team Reporting: Gamemode One
• Verification Build: Preview 1.21.20.23
• Summary: The row titles in the marketplace and dressing room are no longer WCAG compliant as they do not appear as white text on the background.
• Impact: Players with vision impairment will struggle to read parts of the marketplace
• Repro Steps:
  1. Launch Minecraft Preview 1.21.20.23
  2. Open the dressing room, observe issue on featured row
  3. Click on Character Creator, observe issue on featured items and marketplace pass
  4. Open the Marketplace, observe issue on the row "new"
• Repro Rate: 3/3
• Observed Results: 
  • Contrast ratios do not meet guidelines, and are as low as 1.356:1
• Expected Results: Text within the marketplace and dressing rooms meets WCAG. 
• Screenshots / Videos Attached: Yes
• Regression Builds: 1.21.02