Create a lint rule for `TriangleDownIcon` inside `trailingAction`

[joshblack]

There are scenarios where folks may use TriangleDownIcon inside of trailingVisual instead of trailingAction. This rule should lint against usage in trailingVisual and recommend/auto-fix the usage to be trailingAction. This is for the Button component.

[lesliecdubs]

@joshblack thanks for filing. Would it be helpful for us to triage this issue in our PRC Planning sync, or is this a placeholder for a task you are planning to take on?

[joshblack]

@lesliecdubs definitely would be useful to triage, I'll add it to the board 👍

Also opened up: #102 to see if we can get them auto-added, as well