[FIX] spp_entitlement_cash: fix maximum amount bug

[emjay0921]

Why is this change needed?

To fix the problem on Cash Entitlements where if Max amount was set the entitlements follows the Max amount value.

How was the change implemented?

Fix the _check_subsidy function.

New unit tests

TestEntitlementManager

Unit tests executed by the author

TestEntitlementManager

How to test manually

• Install or Upgrade spp_entitlement_cash.
• Create a Program with Cash as the Entitlement Manager and set the Max amount.
• Create Cycle and Prepare Entitlements.
• Check if the initial amount is correct.

Related links

#728

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.95%. Comparing base (9d21f2d) to head (96f1d39).
Report is 10 commits behind head on 17.0.

Files with missing lines	Patch %	Lines
spp_entitlement_cash/models/entitlement_manager.py	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             17.0     #742      +/-   ##
==========================================
+ Coverage   75.80%   75.95%   +0.14%     
==========================================
  Files         706      706              
  Lines       17906    17927      +21     
  Branches     2225     2223       -2     
==========================================
+ Hits        13574    13616      +42     
+ Misses       3869     3851      -18     
+ Partials      463      460       -3     

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[sonarqubecloud]

Quality Gate passed

Issues
0 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