🛠️ Refactor: JobsEndpoint - Extract ListEndpoint (DRY/OCP)

[fderuiter]

Refactor JobsEndpoint and mixins.py to enforce SOLID principles and remove duplication.

Changes:

• Extracted ListEndpoint from ListGetEndpoint in imednet/core/endpoint/mixins.py. This new class encapsulates list functionality and allows configuring the paginator class via PAGINATOR_CLS and ASYNC_PAGINATOR_CLS class attributes.
• Updated ListGetEndpoint to inherit from ListEndpoint, maintaining backward compatibility for existing endpoints.
• Updated JobsEndpoint in imednet/endpoints/jobs.py to inherit from ListEndpoint and PathGetEndpointMixin. This removed the manual implementation of list and async_list, delegating to ListEndpoint while overriding the paginator class to JsonListPaginator.
• Updated tests/conftest.py to patch ListEndpoint.PAGINATOR_CLS and ASYNC_PAGINATOR_CLS in paginator_factory and async_paginator_factory fixtures, ensuring tests continue to mock paginators correctly.

Verification:

• Verified behavior with a reproduction script (reproduce_jobs.py) ensuring JobsEndpoint still works correctly for both list and get operations (sync and async).
• Ran existing unit tests tests/unit/endpoints/test_list_get.py and full test suite to ensure no regressions.

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PR created automatically by Jules for task 9819530189907088638 started by @fderuiter

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