exp: Drop checkpoints

[daavoo]

Closes #9221
Closes #8750
Closes #8622
Closes #8009
Closes #7381
Closes #6470
Closes #6194

As part of 3.0 release - (see checklist: #7093)

• Docs: exp: Drop checkpoints. dvc.org#4442

[codecov]

Codecov Report

Patch coverage: 84.21% and project coverage change: +0.04 🎉

Comparison is base (182728d) 91.15% compared to head (00f2c7d) 91.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9271      +/-   ##
==========================================
+ Coverage   91.15%   91.20%   +0.04%     
==========================================
  Files         475      473       -2     
  Lines       37240    36660     -580     
  Branches     5354     5222     -132     
==========================================
- Hits        33947    33435     -512     
+ Misses       2711     2670      -41     
+ Partials      582      555      -27     

Impacted Files	Coverage Δ
dvc/api/experiments.py	91.66% <ø> (+1.66%)	⬆️
dvc/commands/experiments/run.py	100.00% <ø> (+18.42%)	⬆️
dvc/commands/experiments/show.py	90.00% <ø> (ø)
dvc/commands/run.py	89.65% <ø> (ø)
dvc/commands/stage.py	75.63% <ø> (-0.21%)	⬇️
dvc/env.py	100.00% <ø> (ø)
dvc/repo/experiments/exceptions.py	72.34% <ø> (-2.66%)	⬇️
dvc/repo/experiments/executor/local.py	86.92% <ø> (-2.79%)	⬇️
dvc/repo/experiments/executor/ssh.py	29.81% <ø> (+0.18%)	⬆️
dvc/repo/experiments/queue/tempdir.py	68.13% <ø> (+1.81%)	⬆️
... and 31 more

... and 26 files with indirect coverage changes

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[shcheklein]

That was fast :) I don't think we discussed to drop this in the DVC itself yet. @dberenbaum wdyt? are we good with this? or we want to hide it first and think about the alternative?

[daavoo]

That was fast :) I don't think we discussed to drop this in the DVC itself yet. @dberenbaum wdyt? are we good with this? or we want to hide it first and think about the alternative?

To clarify. It is not my intention to merge and drop it right away. I am planning to discuss with the team a branching strategy for the major release and that is where these draft P.Rs would go.

I just wanted to have the work done so:

• It is easier to just rebase on the P.R.
• When we discuss the major release, it doesn't bias the fact that "we still have to do this and that takes time", because it is done.