[DEPR]: [dupe] Legacy ("V1") Content Libraries

[connorhaugh]

This has been moved to #37931

[kdmccormick]

I assigned Connor and I since we're working on wrapping up the replacement (V2 content libraries). V1 library support will likely continue through Quince and then be removed either in time for Redwood or S. Not sure yet who will be doing the removal.

[dianakhuang]

@kdmccormick are you still committed to owning this DEPR ticket for near future? If you aren't, we can move it back into 'Proposed' until you (and/or Connor) are ready to pick it back up again.

[kdmccormick]

Yep, I'm still OK owning this.

The new direction of the Libraries project is that there will be a period of cross-compatibility between V1 and V2 libraries rather than an in-place V1->V2 migration. V1 library support won't be removed until Teak at the earliest. I don't have enough solid details to formally communicate that right now, so I'll move this back to Proposed and re-communicate at some point.