Fix declaration-block-no-redundant-longhand-properties autofix for font-variant

[Mouvedia]

What minimal example or steps are needed to reproduce the bug?

a {
  font-variant-ligatures: foo;
  font-variant-position: foo;
  font-variant-caps: foo;
  font-variant-numeric: foo;
  font-variant-alternates: foo;
  font-variant-east-asian: foo;
  font-variant-emoji: foo;
}

What minimal configuration is needed to reproduce the bug?

{
  "rules": {
    "declaration-block-no-redundant-longhand-properties": true
  },
  "fix": true
}

How did you run Stylelint?

https://stylelint.io/demo

What did you expect to happen?

a {
  font-variant: foo foo foo foo foo foo foo;
}

ref: https://www.w3.org/TR/css-fonts-4/#font-variant-prop

Do you have a proposal to fix the bug?

update properties.mjs