[Regression] Fix @Links layout rendering for grid styles

[mportiz08]

Bug/issue #, if applicable: 179413082

Summary

#1018 introduces a regression for the way that columns are rendered within the @Links DocC directive when the visual style is either compactGrid or detailedGrid.

This happens because the new align-items property has a default of flex-start, which has unintended consequences for the way that the TopicsLinkCardGrid component composes the Column component without setting an explicit alignment.

By changing the default value from flex-start to normal, we can fix the unexpected rendering for the @Links directive without impacting the new enhancement to support the alignment property for @Column.

Testing

Steps:

1. Create or test some DocC content that utilizes @PageImage and @Links(visualStyle: detailedGrid)
2. Verify that the grid items rendered for the links continue to look the way they should, with images appearing in a fixed grid pattern.
3. Verify that other content using @Column(alignment: leading|center|trailing) still renders with the expected alignment for its items as implemented in Add support for optional alignment property on row columns #1018

Checklist

Make sure you check off the following items. If they cannot be completed, provide a reason.

• Added tests (CSS-only change)
• Ran npm test, and it succeeded
• Updated documentation if necessary