Issue/12751 stale test folder path after specifying source folder

[deepjoshi11th]

Description

Specified sourceFolder value doesn't properly propagate to test directory.
After my changes the source folder change is reflected entire generated project as expected.

Fixes: issue 12751 in swagger-codegen repo

Type of Change

• 🐛 Bug fix
• ✨ New feature
• ♻️ Refactor (non-breaking change)
• 🧪 Tests
• 📝 Documentation
• 🧹 Chore (build or tooling)

Checklist

• I have added/updated tests as needed
• I have added/updated documentation where applicable
• The PR title is descriptive
• The code builds and passes tests locally
• I have linked related issues (if any)

How to Test

I have source code for both the repo swagger-codegen-generators and swagger-codegen. Along with that the issue page have 2 files provided which are CodeCofig.json and test.yaml

cd swagger-codegen-generators
mvn clean install
cd ../swagger-codegen
mvn clean package
cd ..
rm -rf bug-12751/code-debug
java -jar swagger-codegen/modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -l csharp -i bug-12751/test.yaml -c bug-12751/CodeConfig.json -o bug-12751/code-debug
 cd bug-12751/code-debug/
dotnet build