Add totalRefundAmount to webshop permit GraphQL

[danjacob-anders]

Context

PV-736

How Has This Been Tested?

Tested manually

Manual Testing Instructions for Reviewers

In webshop, create and then end permits:

1. Fixed permit, 1 month ahead, start now (=0 Refunds)
2. Fixed permit, 3 months ahead, start now (=2 months refunds)
3. Open permit (=0 refunds)

Refund amount at cancel should be same as the amount actually refunded in the database, i.e. if 120 EUR is refunded in the DB/backend, then 120 EUR should be shown in the intermediate End Permit refund summary.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5c73b38) 82.46% compared to head (bd4c082) 82.46%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #434   +/-   ##
========================================
  Coverage    82.46%   82.46%           
========================================
  Files          152      152           
  Lines         9383     9383           
========================================
  Hits          7738     7738           
  Misses        1645     1645           

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[mhieta]

LGTM!