This pull request adds comprehensive support for parsing and handling Ansible collection requests specified as Git URLs, including those with optional dependencies. It introduces new utility functions for Git URL detection and parsing, updates the collection request parsing logic to correctly distinguish between Git URLs and local paths, and provides an extensive test suite to ensure robust handling of various Git URL formats and edge cases.

Git URL support in collection parsing:

• Added is_git_url function to reliably detect whether a string is a Git URL, supporting multiple formats (e.g., git+https, git+ssh, https, git@) (src/ansible_dev_environment/collection.py).
• Added parse_git_url_collection_name function to extract the collection namespace and name from a Git URL using pattern matching and heuristics (src/ansible_dev_environment/collection.py).

Collection request parsing enhancements:

• Updated parse_collection_request to handle Git URLs both with and without optional dependencies, ensuring correct assignment of namespace, name, source, and local flags (src/ansible_dev_environment/collection.py).

Environment variable inheritance for Git executable:

• Added **os.environ to the environment dictionary when running ansible-galaxy commands in both _install_galaxy_collections and _install_local_collection methods (src/ansible_dev_environment/subcommands/installer.py).
• This ensures that the Git executable can be found in the system PATH when ansible-galaxy needs to clone repositories from Git URLs.
• Without inheriting the parent process environment, ansible-galaxy would fail to locate the git command, preventing installation of collections from Git sources.

Testing and validation:

• Added a new test module tests/unit/test_collection_git_url.py with parameterized tests for Git URL detection, collection name parsing, and integration with the collection request parser, covering various formats and edge cases.