refactor(ui): update check builder design

[alexpaxton]

Closes #15023
Closes #14955

• Remove the matching rules card (@russorat says it doesn't work and is not critical for next week)
  • I did not delete the component for this in case we want to add it back in after launch
• Move Status Message Template into its own card and add some documentation
• Cards in check builder stretch to fill the screen width, but also have minimum sizes to avoid being squished on smaller screens

• CHANGELOG.md updated with a link to the PR (not the Issue)
• Well-formatted commit messages
• Rebased/mergeable
• Tests pass
• http/swagger.yml updated (if modified Go structs or API)
• Documentation updated or issue created (provide link to issue/pr)
• Signed CLA (if not already signed)

[chnn]

:)

[nisley]

I'm a little concerned that it is very hard to know which rule matches. One mitigation is we simplified the tag matching to explicit ==

We should work on visualizing matches after launch, but I agree on approving this for GA launch.