[RHCLOUD-23629] Update Cost Management templates

[g-duval]

[josejulio]

Great work!

I just have the nitpick about the variable being used only by tests

[codecov-commenter]

Codecov Report

Base: 60.70% // Head: 61.21% // Increases project coverage by +0.50% 🎉

Coverage data is based on head (121f5c4) compared to base (fc7f146).
Patch coverage: 98.24% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1695      +/-   ##
============================================
+ Coverage     60.70%   61.21%   +0.50%     
- Complexity     1256     1299      +43     
============================================
  Files           246      246              
  Lines          6200     6242      +42     
  Branches        597      597              
============================================
+ Hits           3764     3821      +57     
+ Misses         2222     2205      -17     
- Partials        214      216       +2     

Impacted Files	Coverage Δ
.../notifications/templates/EmailTemplateFactory.java	43.90% <0.00%> (ø)
.../cloud/notifications/templates/CostManagement.java	89.06% <100.00%> (+89.06%)	⬆️

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[josejulio]

lgtm