fix: Card component background color

[kgabryje]

SUMMARY

After upgrading the Card component to antd 5, we forgot about the background color token, resulting in cards having blue-ish background color instead of gray.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

After:

TESTING INSTRUCTIONS

Verify that the card components in SQL Lab (the query in the Results tab) and Dataset edit -> Settings have gray backgrounds

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[michael-s-molina]

@kgabryje @geido I'm following the fixes for the Ant Design migration. Some bugs are hard to detect but this one seems really easy to check during the PR review. Are we missing some manual tests when reviewing these migrations?

[rusackas]

/korbit-review

[kgabryje]

@michael-s-molina on 1 hand I agree that this should have been caught by looking at the storybook during the review, but on the other - can't say for others, but I probably wouldn't notice that the color had changed. I wish details like this were caught by visual regression tests