Use config for admin RSS links, ref #2741

[sreichel]

Description (*)

@luigifab made a good observation in #2741. RSS links show up on admin grids regardless of RSS is disabled.

I changed it bit different:

Admin Pending Rewies RSS

• flat tables are disabled here, so we cant filter by products store easly
• -> made config global

Admin Low Stock RSS

• whe have only one inventory, only products can be assigned to different websites
• -> made config global

Admin New Order RSS

• use config to show/hide links per storeview
• new; show only orders for filtered store (default/no filter shows all)
• new; config option for days to mark orders as new

Fixed Issues (if relevant)

1. Closes Hide and show RSS links #2741

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
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[luigifab]

I tested but for me, when I enable RSS link only for one store, the link is never displayed in products/orders/reviews grid.

[sreichel]

I tested but for me, when I enable RSS link only for one store

With my change you cannot enable/disable "Admin Review Notification" per store. It's changed to global scope for admin grid.