#22266 Allow GET method for products alerts

[ilnytskyi]

Description (*)

The classes
\Magento\ProductAlert\Controller\Add\Stock
\Magento\ProductAlert\Controller\Add\Price

Has been marked with \Magento\Framework\App\Action\HttpPostActionInterface
that caused 404 page issue after a redirect in \Magento\Customer\Controller\Account\LoginPost

Fixed Issues (if relevant)

1. Product Alert after login shows 404 page #22266

Manual testing scenarios (*)

1. Click subscribe for stock alert on product page
2. Log in
3. See product page and message about successful subscription for notification

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

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[orlangur]

@ilnytskyi GET must be implemented as separate action I believe.

Cc: @nmalevanec

[ilnytskyi]

@orlangur
All actions in this module only receive requests to subscribe customer for notification, I am not sure what exactly has to be introduced in separate GET action.
What was the reason to restrict this method to allow only POST ?
I belive the problem is here Magento\Customer\Controller\Account\LoginPost::execute that caused by setting up just a url to redirect here
\Magento\ProductAlert\Controller\Add::dispatch btw then we could just mark this Add class with HttpPostActionInterface

[ilnytskyi]

Closed since similar changes were implemented in #23218 by @ArjenMiedema
and no answer was given in this topic

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[korostii]

FYI as of 2.3.5 it still gives 404 - unless you either add both of those interfaces, ass suggested by this PR (or, alternatively, remove them completely), tested this myself + here's a testimonial from stackoverlow:
https://magento.stackexchange.com/questions/269825/magento-2-customer-click-stock-alert-on-product-page-after-logged-in-it-shows
IMO this should be reopened and merged in. Can this be picked up please @magento-engcom-team ?