Equal heights updates

[bartaz]

Done

• removes bottom spacing from the component
• removes full width dividers
• updates dividers to use low contrast border colour
• updates divider class names to be easier to handle (from has-1st-divider to has-divider-1) (this is technically breaking change, but as it's barely used we can get away with it)

Fixes WD-10920

QA

• Open demo
• Check the divider line (across columns) on large screen, make sure it's using low contrast border color
• Check if the divider is removed on smaller screens (medium and small)
• Make sure there is no bottom padding on the p-equal-heights-row component element
• Review updated documentation:
  • https://vanilla-framework-5081.demos.haus/docs/patterns/equal-height-row#cross-column-dividers

Check if PR is ready for release

If this PR contains Vanilla SCSS code changes, it should contain the following changes to make sure it's ready for the release:

• PR should have one of the following labels to automatically categorise it in release notes:
  • Feature 🎁, Breaking Change 💣, Bug 🐛, Documentation 📝, Maintenance 🔨.
• Vanilla version in package.json should be updated relative to the most recent release, following semver convention:
  • if CSS class names are not changed it can be bugfix relesase (x.x.X)
  • if CSS class names are changed/added/removed it should be minor version (x.X.0)
  • see the wiki for more details
• Any changes to component class names (new patterns, variants, removed or added features) should be listed on the what's new page.

[webteam-app]

Demo

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