Core: add sniffs to check there is no blank line before a function cl…

…ose brace

> 1. There should be no blank line between the content of a function and the function’s closing brace.

Includes removing this rule from the WPCS native ruleset in which we already enforced it (as it will now be inherited from the `WordPress` ruleset).

Refs:
* https://make.wordpress.org/core/2020/03/20/updating-the-coding-standards-for-modern-php/ - Function closing brace section

Loosely related to WordPress#1101

.phpcs.xml.dist

@@ -30,8 +30,6 @@
 		</properties>
 	</rule>
 
-	<rule ref="PSR2.Methods.FunctionClosingBrace"/>
-
 	<!-- Check code for cross-version PHP compatibility. -->
 	<config name="testVersion" value="5.4-"/>
 	<rule ref="PHPCompatibility">

WordPress-Core/ruleset.xml

@@ -560,6 +560,9 @@
 	<!-- Covers rule: Assigning the return value of an object instantiation by reference is not allowed. -->
 	<!-- Not checked. This is a parse error since PHP 7.0. See: https://3v4l.org/W2Qj6 -->
 
+	<!-- Covers rule: There should be no blank line between the content of a function and the function's closing brace. -->
+	<rule ref="PSR2.Methods.FunctionClosingBrace"/>
+