PHPCS: fix bug in ruleset

Hmm... this is an awkward one and may need fixing in PHPCS 4.0, but in the mean time, let's fix it here.

The base `Yoast` ruleset includes select sniffs from the `WordPressVIPMinimum` ruleset. These sniff do not apply to the PHPUnit Polyfills package.

Now, when an `<exclude name="..."/>` rule references a ruleset name to _exclude_ those sniffs, that whole standard is read and included, after which the individual sniffs from the ruleset are excluded again.

This also means that if such a ruleset _also_ includes sniffs from other standards and/or customizations (changes in severity/excludes/messaging/properties etc) to sniffs from other standards, those sniffs from other standards will still be included and the customizations still be applied.

This will often silently lead to unexpected side-effects, like in the case of the exclusion of the `WordPressVIPMinimum` ruleset, which meant that certain rules we _do_ want applied, like "no superfluous whitespace at the end of a line", got unintentionally excluded.

Fixed now by excluding the individual sniffs from the `WordPressVIPMinimum` standard which were included by the `Yoast` ruleset, instead of excluding the whole `WordPressVIPMinimum` standard.

Includes various fixes to clean up the codebase for things which are now (correctly) being flagged again.

.phpcs.xml.dist

@@ -51,7 +51,10 @@
 		<exclude name="WordPress.WP"/>
 		<exclude name="Yoast.Yoast.JsonEncodeAlternative"/>
 		<exclude name="Yoast.NamingConventions.ObjectNameDepth.MaxExceeded"/>
-		<exclude name="WordPressVIPMinimum"/>
+		<exclude name="WordPressVIPMinimum.Classes.DeclarationCompatibility"/>
+		<exclude name="WordPressVIPMinimum.Hooks.AlwaysReturnInFilter"/>
+		<exclude name="WordPressVIPMinimum.Security.EscapingVoidReturnFunctions"/>
+		<exclude name="WordPressVIPMinimum.Security.ProperEscapingFunction"/>
 
 		<!-- Exclude select "modern PHP" sniffs, which conflict with the minimum supported PHP version of this package. -->
 		<exclude name="SlevomatCodingStandard.Classes.ModernClassNameReference"/><!-- PHP 5.5+ -->

src/TestListeners/TestListenerSnakeCaseMethods.php

@@ -11,6 +11,8 @@
 
 /**
  * Renamed snake_case TestListener method collection used by the TestListenerDefaultImplementation traits.
+ *
+ * @phpcs:disable VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable -- This is intentional as these are template methods.
  */
 trait TestListenerSnakeCaseMethods {
 

tests/TestListeners/Fixtures/TestListenerImplementation.php

@@ -8,6 +8,8 @@
 /**
  * TestListener implementation for testing the TestListener cross-version
  * TestListenerDefaultImplementation trait.
+ *
+ * @phpcs:disable VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable -- This is intentional. These params can be used, but don't have to be.
  */
 class TestListenerImplementation implements TestListener {