Filters: Simplify options

[psealock]

Fixes #1678
Fixes #1680

• Remove "Top *" from filters list for Coupons, Products, Categories, and Variations Reports.
• Remove "Single Category" and "Category Comparison" filters from Products Report.

The Categories Report uses the /products/stats endpoint under the hood. Since the Product Report had category related filters, the resulting filter query used them, but now it must use the Category filters config, so some endpoint mapping was required.

Detailed test instructions:

1. Coupons, Products, Categories, and Variations Reports should no longer have "Top *" options in the Show menu. For example, Top Categories by Items Sold will no longer be there.
2. Ensure Single Category" and "Category Comparison" filters from Products Report are no longer available but are on the Categories Report.
3. Check that links to categories from other reports do not point to the Products Report.

[joshuatf]

Nice and clean- LGTM! 👍

[LevinMedia]

heya @psealock I noticed a bug here:

when switching from "All" to "Comparison", it automatically changes the chart to comparison mode:

that shouldn't happen until a user has selected at least two things and clicks compare.

[LevinMedia]

Also noting the first portion of #1680 was missing from this PR. When viewing a single product category in the category report, you should see a list of all it's child products.