Context parameter in openeo.UDF.from_file() causes confusion

A user let us know that the following code does not pass the context to his UDF:

cube = cube.apply_neighborhood(
    openeo.UDF.from_file("test_udf.py"),
    size=[
        {"dimension": "x", "unit": "px", "value": 32},
        {"dimension": "y", "unit": "px", "value": 32}
    ],
    overlap=[],
    context={"test_variable": "Definitely not None"}
)

The solution was to pass the context in the from_file method instead:

cube = cube.apply_neighborhood(
    openeo.UDF.from_file("test_udf.py", context={"test_variable": "Definitely not None"}),
    size=[
        {"dimension": "x", "unit": "px", "value": 32},
        {"dimension": "y", "unit": "px", "value": 32}
    ],
    overlap=[],
)

We should either:

• Make it clear that the context parameter should not be used when an UDF object is passed
• Merge the two context parameters in the process graph

Start by tracing openeo.UDF.from_file() and apply_neighborhood() to see how each context parameter enters the process graph. Check the generated graph for the example in the issue; done when the context behavior is made unambiguous and the two stated usage patterns are either documented clearly or handled consistently.