Fix build dependency

[olexale]

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[Copilot]

Pull Request Overview

This PR fixes the build dependency by upgrading to version 3.0.0 and removes the package's built-in steps in favor of generating them locally. The main changes include replacing flutter_test with the generic test package across all test files and removing pre-built step implementations.

• Updates dependencies to newer versions (build to ^3.0.0, test to ^1.26.3, etc.)
• Replaces flutter_test imports with test imports across all test files
• Removes pre-built step files and configuration that provided them

Reviewed Changes

Copilot reviewed 76 out of 79 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pubspec.yaml	Updates dependencies and removes Flutter-specific test dependencies
test/*_test.dart	Replaces flutter_test imports with test package imports
lib/step/*.dart	Removes all pre-built step implementations
lib/bdd_options.yaml	Removes configuration file for external steps
example/	Updates example configuration and generated imports
test/feature_generator_test.dart	Refactors test generation logic to use assertion-based testing

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