test: add unit tests for curl wrapper

[Soner (shyim)]

This PR adds comprehensive unit tests for the curl wrapper package.

Changes

• Added curl_wrapper_test.go with test coverage for:
  • Command initialization
  • HTTP method configuration
  • Bearer token authentication
  • Custom arguments handling
  • URL manipulation
  • Header management
  • Multiple options combination
  • Command options generation

Test Coverage

The tests cover all main functionality except the Run() method which requires system integration testing.

Notes

• Uses testify/assert for cleaner test assertions
• Follows Go 1.24 syntax and best practices
• Implements table-driven tests where appropriate
• Uses subtests for better organization and failure identification