wpfooter credit hide the plugin activation button

[rafiq91]

Way to reproduce:

1. Make sure you have 4/5 admin notice
2. Try uploading a plugin manually which is already installed
3. You should notice the Replace and Activate button is not showing because the footer credit 'Thanks for building with WordPress' is above the button.

Screenshot: ​https://prnt.sc/VnoheFeHj6J7

Environment:

WP: Latest v6.1.1
Theme: 2020
OS: Mac OS 13.0.1
Screen Width: 1680 pixels
Screen Height: 1050 pixels

…present

Trac ticket: https://core.trac.wordpress.org/ticket/57772#ticket

[sakibmd]

PR looks fine. Thanks, @rafiq91

[alexanderkoledov]

Thank you @rafiq91 ! I think we can go further with this. Because position: relative leaves the element on the normal flow and we don't need to change it, we can get rid of positioning. Also all child #wpfooter elements do not need to be positioned relative to #wpfooter.