Enhancement: Enable no_useless_nullsafe_operator fixer

[localheinz]

This pull request

• enables the no_useless_nullsafe_operator fixer

Follows #620.

💁‍♂️ For reference, see https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/v3.9.1/doc/rules/operator/no_useless_nullsafe_operator.rst.

[codecov]

Codecov Report

Merging #623 (e1bbcf8) into main (14cfce3) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #623   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         7         7           
===========================================
  Files              2         2           
  Lines             20        20           
===========================================
  Hits              20        20           

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