refactor: revert changes to make path normalization optional

[jcouball]

Revert the changes introduced in #64 that allowed the user of this lib to make path normalization optional. The purpose of #64 was to make tests easier to write. The downside was that the library code itself became more complicated.

Instead this change removes that and adds mocking for path normalization when it is appropriate to shut it off for tests.

[Copilot]

Pull Request Overview

This PR reverts the changes from #64 that made path normalization optional by removing the extra parameter and simplifying the code, while introducing mocks in tests to control path normalization for testing purposes.

• Removed the optional normalization parameter from the Worktree and Repository API.
• Updated tests to use shared examples for error handling and to mock path normalization.
• Simplified and refactored initialization logic in production code.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
spec/spec_helper.rb	Added shared examples for mocking the normalize_path method for testing.
spec/lib/ruby_git/worktree_spec.rb	Removed the optional normalization parameter and outdated contexts.
spec/lib/ruby_git/worktree_add_spec.rb	Updated tests to use shared examples for error handling after removing normalize_path.
spec/lib/ruby_git/repository_spec.rb	Removed the optional normalization parameter and adjusted test setup accordingly.
lib/ruby_git/worktree.rb	Removed the optional normalization parameter and refactored the repository accessor.
lib/ruby_git/repository.rb	Removed the optional normalization parameter from initialization and updated its behavior.

Comments suppressed due to low confidence (2)

lib/ruby_git/worktree.rb:218

• The documentation for the initialize method still references the 'normalize_path' parameter, which has been removed. Please update or remove these comments to reflect the new method signature.

# @param normalize_path [Boolean] if true, path is converted to an absolute path to the root of the working tree

lib/ruby_git/repository.rb:27

• The initialize method documentation still mentions the 'normalize_path' parameter even though it has been removed. Please update the documentation to match the new signature.

# @param normalize_path [Boolean] if true, path is converted to an absolute path to the root of the working tree