Fix spacing between errors in Geo Node Cards

What does this MR do?

Closes #196075 (closed)

This removes the additional spacing between errors introduced in !21284 (merged)

Implementation:

A new class unstyled-list-sm that extends unstyled-list and reduces the amount of padding added to each <li>

Screenshots

	Error List Spacing
before
after

There were only 2 places it was being used in Geo, which I replaced with the new class:

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry Not needed because this is changed in the same milestone
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Closes #196075 (closed)