[IMP] spp_change_request_add_farmer: improve code and test

[emjay0921]

Why is this change needed?

To modify the Add Farmer CR to be able to add Farmer to a Farm.

How was the change implemented?

Modified and Improved the CR for Add Farmer

New unit tests

TestChangeRequestAddFarmer

Unit tests executed by the author

TestChangeRequestAddFarmer

How to test manually

• Install or Upgrade spp_change_request_add_farmer.
• Create CR with Type Add Farmer.
• Proceed to Fill the required Fields.
• Validate and Apply.

Related links

#682

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 3 lines in your changes missing coverage. Please review.

Project coverage is 75.84%. Comparing base (9d21f2d) to head (532e894).
Report is 6 commits behind head on 17.0.

Files with missing lines	Patch %	Lines
...est_add_farmer/models/change_request_add_farmer.py	81.25%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             17.0     #748      +/-   ##
==========================================
+ Coverage   75.80%   75.84%   +0.04%     
==========================================
  Files         706      705       -1     
  Lines       17906    17771     -135     
  Branches     2225     2198      -27     
==========================================
- Hits        13574    13479      -95     
+ Misses       3869     3840      -29     
+ Partials      463      452      -11     

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[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud