Request FTP and SSH credentials when needed during shiny updates

This is a restoration of [31749] which was reverted in [31755].

It includes a number of enhancements from the original version.  Namely:
 * Not doing a credential check in src/wp-includes/script-loader.php
 * Add new function `wp_print_request_filesystem_credentials_modal`
 * update the version number in the list table when a plugin is updated

UI still needs further work, but this basic version should enable more testing

Props ericlewis, jorbin
See #31528


Built from https://develop.svn.wordpress.org/trunk@31811


git-svn-id: http://core.svn.wordpress.org/trunk@31793 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/forms-rtl.css

@@ -848,6 +848,27 @@ table.form-table td .updated p {
 	margin-bottom: 5px;
 }
 
+/*------------------------------------------------------------------------------
+   Credentials check dialog for Install and Updates
+------------------------------------------------------------------------------*/
+
+.request-filesystem-credentials-dialog {
+	display: none;
+}
+
+.request-filesystem-credentials-dialog .notification-dialog {
+	top: 15%;
+}
+
+.request-filesystem-credentials-dialog-content {
+	margin: 25px;
+}
+
+.request-filesystem-credentials-dialog-content input[type="text"],
+.request-filesystem-credentials-dialog-content input[type="password"] {
+	width: 85%;
+}
+
 /* =Media Queries
 -------------------------------------------------------------- */
 

wp-admin/css/forms.css

@@ -848,6 +848,27 @@ table.form-table td .updated p {
 	margin-bottom: 5px;
 }
 
+/*------------------------------------------------------------------------------
+   Credentials check dialog for Install and Updates
+------------------------------------------------------------------------------*/
+
+.request-filesystem-credentials-dialog {
+	display: none;
+}
+
+.request-filesystem-credentials-dialog .notification-dialog {
+	top: 15%;
+}
+
+.request-filesystem-credentials-dialog-content {
+	margin: 25px;
+}
+
+.request-filesystem-credentials-dialog-content input[type="text"],
+.request-filesystem-credentials-dialog-content input[type="password"] {
+	width: 85%;
+}
+
 /* =Media Queries
 -------------------------------------------------------------- */