Walk back deprecation of TO APIv3, add instability warnings for 4.0 #6209
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With the recent discussion on the mailing list we've decided to move forward with TO APIv4 being "unstable", which means that APIv3 - being the latest stable version - cannot be deprecated. This PR walks back changes made to deprecate it, and adds a couple of warnings about the instability of TO API v4.
Which Traffic Control components are affected by this PR?
What is the best way to verify this PR?
Read the warnings, make sure docs build correctly, etc.
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