Remove null safety codelab for now #5539
Merged
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Removes the null safety codelab and references to it. In a few days, I will follow up soon with some new samples on the cheatsheet to replace this.
This codelab is the least viewed on the site and no longer makes sense to separate from other language learning. As mentioned, I will follow up with a few new samples on the cheatsheet as a stop-gap until we implement a consolidated new-learner experience.
Contributes to #5382
Contributes to #4603
Closes #3093