feat: generate opene charm

[ahmad-can]

Related Charm https://review.opendev.org/c/openstack/sunbeam-charms/+/984509

[Copilot]

Pull request overview

This PR adds a new “opene” storage backend implementation (Open-E JovianDSS iSCSI) to Sunbeam, along with unit tests and wiring it into the existing backend test suite/fixtures.

Changes:

• Introduce OpeneBackend and OpeneConfig under sunbeam.storage.backends.opene.
• Add unit tests for the new backend and include it in the shared backend uniqueness/parameterized tests.
• Extend backend test fixtures to provide an opene_backend and include it in any_backend parametrization.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sunbeam-python/sunbeam/storage/backends/opene/backend.py	Adds the Open-E backend class and its Pydantic config model.
sunbeam-python/sunbeam/storage/backends/opene/__init__.py	Declares the new backend package.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_opene.py	New unit tests for Open-E backend behavior and config validation.
sunbeam-python/tests/unit/sunbeam/storage/backends/test_common.py	Extends common backend uniqueness/expectation tests to include opene.
sunbeam-python/tests/unit/sunbeam/storage/backends/conftest.py	Adds an opene_backend fixture and includes it in any_backend.

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