Solution unmarshall error when importing solution with missing dependencies

[mawasile]

This pull request introduces changes mainly aimed at improving the error handling in the solution creation process and updating the terraform dependencies. The most significant changes include the addition of the null provider in the terraform dependencies, the introduction of more detailed error messages in the solution creation process, and the addition of debugging information in the solution import function.

Terraform dependencies update:

• .devcontainer/features/acceptance_test_dependencies/main.tf: Added the null provider to the terraform dependencies.
• .devcontainer/features/local_provider_dev/terraform.rc: Specified the installation path for the null provider.

Error handling improvements:

• internal/powerplatform/services/solution/api_solution.go: Imported the errors package and updated the error handling in the CreateSolution function to provide more detailed error messages. [1] [2]

Model changes:

• internal/powerplatform/services/solution/model_solution.go: Updated the StageSolutionImportResponseDto struct to include more detailed information about solution validation results and missing dependencies.

Debugging information:

• internal/powerplatform/services/solution/resource_solution.go: Added a debug log to print the current working directory in the importSolution function.

#348