Deorphanize Node

[Tom-Willemsen]

By giving it a parent, which is the module in which the ScanningInstrument class was defined

Description of work

Fixes an error of the form astroid.exceptions.ParentMissingError: Parent not found on <NodeNG ...>

To test

Which ticket does this PR fix?

Acceptance criteria

List the acceptance criteria for the PR

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Code Review

• Is the code of an acceptable quality?
• Are there unit tests in place? Are the unit tests small and test the a class in isolation?
• Have the changes been documented in the release notes. If so, do they describe the changes appropriately?

Functional Tests

• Do changes function as described? Add comments below that describe the tests performed.
• How do the changes handle unexpected situations, e.g. bad input?
• Has developer documentation been updated if required?

[Tom-Willemsen]

Verified by pip installing this commit on LARMOR.

Once this is merged, make a proper point-release out of it, and then deploy that to larmor instead. Also deploy to other instruments which use the old scans library (sans+reflectometers). Can be done as an ssh backdoor pip upgrade