Context

Based on !10792 (merged). For restarting Oxford (#6478 (closed)), let's first remove the previous Oxford. This is the removal of tests on Oxford 1.

things related to endorsements-to-attestations are kept as related to Nairobi + 1
everything else that was for Oxford + 1 are re targeted to Nairobi + 1

Manually testing the MR

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.
Select as Assignee the next person who should take action on that MR