3.0 checklist

[dberenbaum]

Experiments updates

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1. Experiment sharing #4440
   p1-important +1
2. Add exp sharing to Studio in DVC exp get started #4498
   C: start +1
3. cases: update experiment tracking #4087
   A: docs C: cases ⌛ status: wait-core-merge +3

Other updates

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1. Model registry docs #4423
   A: docs p1-important +2
   
2. studio: cloud exps draft #4589
   +0
   
3. dvc add: virtual operations #4532
   C: guide C: ref p1-important +3
   
4. guide: add allow-missing scenarios #4585
   blocked +1
   

Deprecations

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1. Drops external outputs and updates external data guides #4574
   blocked +1
   
2. exp: Drop checkpoints dvc#9271 (@daavoo can we revive exp: Drop checkpoints. #4442?)
3. Remove stage-level vars (@skshetry)
4. drop dos2unix behaviour dvc#4658 (@pmrowla)
5. add: deprecate flags #4594 (rename dvc add --jobs to dvc add --remote-jobs; remove dvc add --file --recursive --desc --type --labels --meta)
6. exp: drop gc. #4441
   C: ref ⌛ status: wait-core-merge +2
   
7. exp: Drop init. #4415
   +0
   
8. Remove exp show --html
9. exp show: Drop --pcp. #4443
   +0
10. Remove dvc run (@skshetry)
11. Remove --show-json/--show-csv/--show-md in favor of existing --json/--csv/--md flags.
12. Docs for Remove repro/exp run --metrics flag dvc#9457 (@daavoo)

Nice to have

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1. guide: update experiments guide #4401
   C: guide p1-important +2
   

[skshetry]

dvc stage add --run (@skshetry)

stage add --run is not 3.0 only feature. It was documented in #4558.

[skshetry]

dvc run is already removed, thanks to @daavoo in #4296.

[dberenbaum]

Working on experiments guide updates separately, but I think we can close this.