Create an empty Reports Products page, move Reports Programs files around

[tomalec]

This is a baby step for #97 and #98, that would help to develop those two independently.
It also divides the work, that most of renaming and moving around is separated here, and should not blur the picture on other PRs.

Changes proposed in this Pull Request:

• Moves existing Program Reports code into /reports folders and namespace. (0254251)
• Creates an empty /reports/products page. (96c9b11)
• Remove unnecessary style import from MetricNumber - a leftover from Add Program Analytics page #109, which I discovered by the way of moving files around. (2ec329a)

Screenshots:

Detailed test instructions:

0. Checkout this branch,
1. npm install && composer install && npm run build
2. Open http://localhost/wordpress/wp-admin/admin.php?page=wc-admin&path=%2Fgoogle%2Freports%2Fproducts (replace localhost/wordpress with your local env)

Changelog Note:

none

Additional comments

I have stopped before implementing the sub-navigation as required in #98, to:

• make the reviews shorter and easier
• make it possible to implement Reports > Products UI #97 and Add Reports Page Sub Navigation #98 in parallel
• make sure I don't implement the old nav if that's not needed

Given, I'm not native English, I wasn't sure whether the page title should be "Reports Programs", "Programs Reports" or "Program Reports". I left it as it was in Figma's node title.

[ecgan]

The changes look pretty simple, looks good to me. Probably needs some PHP expert's eyes on the PHP code 😄

Given, I'm not native English, I wasn't sure whether the page title should be "Reports Programs", "Programs Reports" or "Program Reports". I left it as it was in Figma's node title.

I think the page title should be "Programs Report", as in "a report about programs" 🤔 .

[jconroy]

I think the page title should be "Programs Report",

Yeah I think I'd agree - either "Programs Report" or just "Programs" and similarly "Products Report" or just "Products".

I look at as we have 2 reports - a "Programs report" and a "Products report".

[jconroy]

Testing well for me, I think it just a couple of the title tweaked for consistency - similar to what @ecgan mentions

#170 (comment)

[jconroy]

Programs Report for consistency below

[jconroy]

Products Report for consistency below