Context

Following !5008 (merged), !5113 (merged), !5114 (merged), !5188 (merged), !5195 (merged), !5222 (merged), !5224 (merged), !5261 (merged), !5262 (merged), !5266 (merged), and finally !5373 (merged), we can now restrict Contract.get_script to originated contracts only because it doesn't make sense for implicit accounts.

Manually testing the MR

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Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
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