added Not have attribute expression

[AlessandroMinoccheri]

Summary
Adds NotHaveAttribute, the missing negative counterpart to HaveAttribute, following the same pattern used by every other expression pair in the codebase (HaveTrait/NotHaveTrait, Implement/NotImplement, etc.).

This allows rules like:

php$rules[] = Rule::allClasses()
    ->that(new ResideInOneOfTheseNamespaces('App\Controller'))
    ->should(new NotHaveAttribute('Deprecated'))
    ->because('deprecated controllers should be removed, not kept in production');

Notes
No breaking changes. No new dependencies.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (44d3a4a) to head (6d92b91).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #615      +/-   ##
============================================
+ Coverage     98.32%   98.33%   +0.01%     
- Complexity      689      693       +4     
============================================
  Files            86       87       +1     
  Lines          1968     1981      +13     
============================================
+ Hits           1935     1948      +13     
  Misses           33       33              

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[fain182]

LGTM 🙂