Always add API import to top of file

[DanielMurphy22]

Description of work. Set the cursor position to top of file to add API import Also remove check for import from future as Python2 not supported

To test:

save a python file locally with some text in the first few lines:

Rebin()
Load()
Rebin(again)

• open this file in the scripteditor in MantidWorkbench.
• Previously the import was added to the end (Or first empty line) but check it is now added to the top of the file.

Fixes #https://github.com/mantidproject/mantid/issues/34386

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Reviewer

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Code Review

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• Does the code conform to the coding standards?
• Are the unit tests small and test the class in isolation?
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Functional Tests

• Do changes function as described? Add comments below that describe the tests performed?
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