Show Settings navigation tabs on Product Sets taxonomy screens

[layoutd]

Changes proposed in this Pull Request:

This PR renders the basic navigation tabs used on "Connection", "Product Sync", and "Advertise" pages, on the "Product Sets" pages as well.

They're rendered (hidden) at the top of the corresponding list + edit pages, and then moved in the DOM and displayed. Depending on page load speed, they might not be available for short period, but I've seen the tabs flicker on all the other settings pages of the extension as well.

• Do the changed files pass phpcs checks? Please remove phpcs:ignore comments in changed files and fix any issues, or delete if not practical.

Screenshots:

Before

After

Other Settings Pages (for comparison)

Detailed test instructions:

1. Connect a store.
2. Navigate around the different sections of the Facebook for WooCommerce extension.
3. Confirm the navigation tabs appear correctly in the different screens related to Product Sets.
4. Try with several browser resolutions (mobile, desktop, etc).
5. Also confirm that the correct menu item is highlighted always (Marketing > Facebook).

Changelog entry

Add - Extension navigation tabs on Product Sets screens.

[brezocordero]

@layoutd
Tested and it works.
I am pre-approving but please remove the commented code.
I have a question about the approach but it is not blocking as this works. It could also be added as a future improvement.

[brezocordero]

@layoutd Thanks for making the changes.
Tested and looks good. 🚢

[layoutd]

Thanks @brezocordero!