Make site_url filter aware of wp-login.php actions

[jfarthing84]

For instance, wp_registration_url() passes the action to site_url():

$registration_url = site_url( 'wp-login.php?action=register' );

However, wp_logout_url() and wp_lostpassword_url() do not. Attaching a patch to fix this.

[audrasjb]

Hello,

5.0.3 is going to be released at the beginning of January. We are currently sorting the remaining tickets in the milestone. Do you think this ticket can be handled/reviewed in the next few days? If not, let's address this in 5.1 which is coming soon.

Adding dev-feedback keywords to see if it can land in 5.0.3.

[desrosj]

Going to punt this to 5.1. It is outside of the scope for 5.0.3 (block
editor bugs, regressions, and major bugs).

[desrosj]

This ticket has not received any attention during the 5.2 cycle. With beta 1 tomorrow, going to punt this to 5.3.

[SergeyBiryukov]

In 45398:

Login and Registration: Pass the action to site_url() in wp_logout_url() and wp_lostpassword_url():

• Make site_url filter in wp_logout_url() aware of the logout action.
• Make network_site_url filter in wp_lostpassword_url() aware of the lostpassword action.

Props jfarthing84.
Fixes #43407.