8808 get api to get text file from backend

[standeren]

Description 💎

• Remove serialization of of json object so list of languages is sent as List directly
• Add endpoint for GetText V2 in new texts controller (NB: the plural AKA new text format version)
• Add method to get text content in new Text Service
• Add method to get text content in AltinnAppGitRepository using new filename: text.*.json
• Change name of old method for getting the text content in AltinnAppGitRepository to include v1
• Add test for GetText endpoint that checks if content retrieved from _TestData with API call is as expected

Verification

• [x] Your code builds clean without any errors or warnings
• [x] Manual testing done (required)
• [x] Relevant automated test added (if you find this hard, leave it and we'll help out)
• [x] All tests run green

Documentation

• [ ] User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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100.0% Coverage
0.0% Duplication