Remove outdated validate constraint step
What does this MR do and why?
We missed removing the instruction to validate the not null constraint when updating the adding not null constraint guideline in !126134 (merged). We're removing it in this MR as we don't need to validate the constraint anymore as we will add a valid constraint in the next release.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #417917 (closed)