Users: Revert use of shared objects for current user.

Reverts [50790].

Props oztaser, ravipatel, dd32, costdev, SergeyBiryukov, tykoted, cu121, xknown.
Fixes #54984.



git-svn-id: https://develop.svn.wordpress.org/trunk@54397 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/pluggable/getUserBy.php

@@ -1,24 +0,0 @@
-<?php
-
-/**
- * @group pluggable
- * @covers ::get_user_by
- */
-class Tests_Pluggable_GetUserBy extends WP_UnitTestCase {
-
-	/**
-	 * @ticket 28020
-	 */
-	public function test_get_user_by_should_return_same_instance_as_wp_get_current_user() {
-		// Create a test user.
-		$new_user = self::factory()->user->create( array( 'role' => 'subscriber' ) );
-
-		// Set the test user as the current user.
-		$current_user = wp_set_current_user( $new_user );
-
-		// Get the test user using get_user_by().
-		$from_get_user_by = get_user_by( 'id', $new_user );
-
-		$this->assertSame( $current_user, $from_get_user_by );
-	}
-}