Remove schain firewall config during cleaner stage

[badrogger]

Changes

• Make cleaner to remove schain firewall config

Testing

• Modified unit tests
• Tested on local network

Performance

• No performance related changes were introduced

[codecov]

Codecov Report

Attention: Patch coverage is 51.80723% with 40 lines in your changes missing coverage. Please review.

Project coverage is 81.41%. Comparing base (59235f8) to head (4e6fd90).
Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
core/schains/firewall/nftables.py	23.33%	23 Missing ⚠️
core/schains/firewall/firewall_manager.py	33.33%	8 Missing ⚠️
core/schains/firewall/rule_controller.py	64.70%	6 Missing ⚠️
core/schains/firewall/utils.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1140      +/-   ##
===========================================
- Coverage    81.61%   81.41%   -0.21%     
===========================================
  Files          103      103              
  Lines         6517     6570      +53     
===========================================
+ Hits          5319     5349      +30     
- Misses        1198     1221      +23     

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