Try to move files from root in dedeicated dir (#27503)

dev/tools/php-cs-fixer/.php-cs-fixer.dist.php

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+<?php
+
+/* PHP 7.0 */
+$finder = (new PhpCsFixer\Finder())
+->in(__DIR__)
+->exclude([
+	'core/includes',
+	'custom',
+	'documents',
+	'doctemplates',
+	'vendor',
+	'install/doctemplates',
+	'htdocs/custom',
+	'htdocs/includes',
+	'htdocs/install/doctemplates',
+])
+->notPath('vendor');
+
+
+/* PHP 7.4+ */
+/*
+$finder = (new PhpCsFixer\Finder())
+	->in(__DIR__)
+	->exclude([
+		'custom',
+		'documents',
+		'htdocs/custom',
+		'htdocs/includes',
+	])
+	->notPath([
+		'vendor',
+	]);
+*/
+
+return (new PhpCsFixer\Config())
+	->setRules([
+		// Apply PSR-12 as per https://wiki.dolibarr.org/index.php?title=Langages_et_normes#PHP:~:text=utiliser%20est%20le-,PSR%2D12,-(https%3A//www
+		'@PSR12' => true,  // Disabled for now to limit number of changes
+
+		// Minimum version Dolibarr v18.0.0
+		// Compatibility with min 7.1 is announced with Dolibarr18.0 but
+		// app is still working with 7.0 so no reason to abandon compatiblity with this target for the moment.
+		// So we use target PHP70 for the moment.
+		'@PHP70Migration' => true,
+		//'@PHP71Migration' => true,
+                // Avoid adding public to const (incompatible with PHP 7.0):
+                'visibility_required' => ['elements'=>['property', 'method']],
+
+		//'strict_param' => true,
+		//'array_syntax' => ['syntax' => 'short'],
+		//'list_syntax' => false,
+		//'visibility_required' => false,
+		'array_syntax' => false,
+		'ternary_to_null_coalescing' => false
+	])
+	->setFinder($finder)
+	// TAB Indent violates PSR-12 "must" rule, but used in code
+	// (See https://www.php-fig.org/psr/psr-12/#24-indenting )
+	->setIndent("\t")
+	// All files MUST use the Unix LF line ending only
+	// https://www.php-fig.org/psr/psr-12/#22-files
+	->setLineEnding("\n")
+;

dev/tools/php-cs-fixer/.phpcs.xml.dist

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+<?xml version="1.0"?>
+<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="PHP_CodeSniffer" xsi:noNamespaceSchemaLocation="phpcs.xsd">
+    <!--
+      Documentation:
+      https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-Ruleset
+      -->
+
+    <rule ref="dev/setup/codesniffer/ruleset.xml"/>
+
+    <arg value="p"/>
+    <arg name="colors"/>
+    <arg name="extensions" value="php,inc" />
+</ruleset>