test(processor): whole-file golden driver + seed python cases

internal/processor/testdata/py_comment_only.py

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+# header comment
+x = 1
+print(x)

internal/processor/testdata/py_comment_only.py.golden

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+x = 1
+print(x)

internal/processor/testdata/py_inline.py

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+x = 1  # set x
+print(x)  # show

internal/processor/testdata/py_inline.py.golden

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+x = 1
+print(x)