Adding methods for building environment in the right order

[happz]

Pull Request Checklist

• implement the feature
• write the documentation

[gemini-code-assist]

Code Review

This pull request centralizes and refactors environment building and refreshing logic across various tmt modules by introducing Environment.build_environment and refresh_intrinsics methods, and establishes a common StepContext base class for step contexts. Feedback recommends correcting the environment variable precedence order in _build_environment to prevent guest-level variables from overriding test-level ones, and returning a copy of the environment in refresh_intrinsics to avoid modifying the cached environment in place.

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[happz]

/packit test