Add native_function_invocation to php-cs-fixer

Problem/Motivation

When we did #3608929: Adopt php-cs-fixer ruleset, we skipped native_function_invocation to avoid breaking too much MR

We merged many big stuff since (#3548884: SourceValueItem field synchronized translations, #3588936: Drupal 12 compatibility and Symfony Constraint API,#3611167: Escape at render, not in sources (rely on Twig autoescape)..) and it is time to reconsider it.

There is at least 676 native function invocation, in 173 files, and add leading \ before function invocation is speeding up resolving: https://blog.devsense.com/2025/optimize-native-function-invocation/#opti...

For example, phpunits tests run between 2% and 4% faster after the change.

Proposed resolution

1. Remove $rules['native_function_invocation'] = FALSE;
2. Run php-cs-fixer