Wp-calypso: Offer only Business & Ecommerce plan when coming from the "Install plugin" section.

[mrfoxtalbot]

When a user arrives to the "add/upgrade" plan section coming from them "Install plugin" link, they should only be offered a Business or Ecommerce plan.

Steps to reproduce

1. Head to https://wordpress.com/plugins/ on a free site
2. Click on "Upgrade to Business to install a plugin" notice
3. The first option will be to upgrade to Premium or Personal

What I expected

I expected to be offered only the plan I need to install plugins, taking into account where I was coming from.

What happened instead

I was offered a lower plan which will not let me install plugins and, if I try again, I will probably be asked a further payment, causing quite a but of frustration and confusion.

Browser / OS version

MacOS 10.13.6 (17G2307)
Google Chrome 79.0.3945.88

Screenshot / Video

Context / Source

dogfooding, #manual-testing

[mrfoxtalbot]

This is somewhat related to this other issue https://github.com/Automattic/wp-calypso/issues/15671

[Aurorum]

Hmm, I think this nudge is meant to send you directly to the Checkout.

https://github.com/Automattic/wp-calypso/blob/6f17a7b64dbdfb1c39f27ecf45f783a8be3ff283/client/my-sites/plugins/plugins-browser/index.jsx#L518-L533

[Aurorum]

But this is still an issue with other nudges where you're not redirected directly to the Checkout. I'll open a PR soon. :)

[Aurorum]

PR in #41044 for this issue. :)

[mmtr]

Seems this was regressed in #41002. #41115 should have fixed it.