Mod. SFW. Atomic approach to updating SFW, phpunit tests

[AntonV1211]

https://app.doboard.com/1/task/28648

[codecov]

Codecov Report

❌ Patch coverage is 78.12500% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 11.46%. Comparing base (57b1c1e) to head (c599821).
⚠️ Report is 43 commits behind head on dev.

Files with missing lines	Patch %	Lines
lib/Cleantalk/ApbctWP/Firewall/SFWUpdateHelper.php	33.33%	4 Missing ⚠️
lib/Cleantalk/ApbctWP/Firewall/SFW.php	88.46%	3 Missing ⚠️

❌ Your patch status has failed because the patch coverage (78.12%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #744      +/-   ##
============================================
- Coverage     11.47%   11.46%   -0.02%     
+ Complexity     5361     5358       -3     
============================================
  Files           256      256              
  Lines         26941    26933       -8     
============================================
- Hits           3092     3087       -5     
+ Misses        23849    23846       -3     

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