refactor: improve cargo-wdk tests

[gurry]

This PR improves cargo-wdk tests by:

• Reducing code duplication
• Shortening tests names to make them easier to understand

I wanted to do this for crates/cargo-wdk/src/actions/build/tests.rs as well but those tests are more complex and therefore require more thinking. Will open a different PR for them.

[Copilot]

Pull Request Overview

This PR refactors cargo-wdk tests to improve code maintainability by consolidating duplicate logic and using more descriptive test names. The changes span three test files, replacing verbose test names with concise ones and extracting common functionality into reusable helper functions.

Key changes:

• Simplified test names from verbose descriptions to concise action-based names
• Created helper functions to eliminate code duplication across test scenarios
• Consolidated file verification logic into reusable utility functions

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
crates/cargo-wdk/tests/new_command_test.rs	Shortened test names and extracted command invocation logic into helper functions
crates/cargo-wdk/tests/build_command_test.rs	Refactored repetitive file verification code into helper functions and simplified test structure
crates/cargo-wdk/src/cli.rs	Consolidated duplicate test logic for architecture detection into parameterized helper functions

[krishnakumar4a4]

LGTM