[FEATURE]: Provide a simple mechanism for loading python test files from mock workspace

[ericvergnaud]

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Problem statement

There is a frequent need to load sample test files content, but workspace_client_mock doesn't implement download.
Also, there is a need to map simple names: import my_file to test file names: my_file.py.txt.__

Proposed Solution

Enhance workspace_client_mock with get_status and download.

Additional Context

No response