Remove scrutinizer

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	comma-separated list of tickets # fixed by the PR, if any

[what-the-diff]

PR Summary

• Removal from .gitattributes
  The exclusion of the file /.scrutinizer.yml from the export-ignore list has been carried out. Now, this file will be included when exporting this repository, ensuring that crucial configurations and settings are not accidentally omitted from any copies made.

• Deletion of .scrutinizer.yml
  The .scrutinizer.yml file — which previously held configurations for PHP analysis and PHPUnit (tools that help improve code quality) — has been deleted. This simplifies the project's structure and avoids confusion, as we're no longer using these tools within this repository.

• Update of README.md
  The badge that displays code coverage statistics in the README.md file now uses Codecov instead of Scrutinizer. Codecov provides more accurate and reliable coverage metrics, offering better visibility into the overall health and robustness of the codebase.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (94bdd94) to head (db022d6).

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #98   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        75        75           
===========================================
  Files              6         6           
  Lines            237       237           
===========================================
  Hits             237       237           

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