exp run: remove exp reset in favor of exp run --reset (#5442)

* exp run: remove `exp reset` in favor of `exp run --reset`

* update command unit test

dvc/command/experiments.py

@@ -924,36 +924,12 @@ def add_parser(subparsers, parent_parser):
         metavar="<experiment_rev>",
     )
     experiments_run_parser.add_argument(
-        "--reset", action="store_true", help=argparse.SUPPRESS,
+        "--reset",
+        action="store_true",
+        help="Reset existing checkpoints and restart the experiment.",
     )
     experiments_run_parser.set_defaults(func=CmdExperimentsRun)
 
-    EXPERIMENTS_RESET_HELP = "Reset and restart checkpoint experiments."
-    experiments_reset_parser = experiments_subparsers.add_parser(
-        "reset",
-        parents=[parent_parser],
-        description=append_doc_link(EXPERIMENTS_RESET_HELP, "exp/reset"),
-        help=EXPERIMENTS_RESET_HELP,
-        formatter_class=argparse.RawDescriptionHelpFormatter,
-    )
-    experiments_reset_parser.add_argument(
-        "-r",
-        "--rev",
-        type=str,
-        default=None,
-        dest="checkpoint_resume",
-        help=argparse.SUPPRESS,
-    )
-    _add_run_common(experiments_reset_parser)
-    experiments_reset_parser.add_argument(
-        "--reset",
-        action="store_const",
-        const=True,
-        default=True,
-        help=argparse.SUPPRESS,
-    )
-    experiments_reset_parser.set_defaults(func=CmdExperimentsRun)
-
     EXPERIMENTS_GC_HELP = "Garbage collect unneeded experiments."
     EXPERIMENTS_GC_DESCRIPTION = (
         "Removes all experiments which are not derived from the specified"

tests/unit/command/test_experiments.py

@@ -87,10 +87,7 @@ def test_experiments_show(dvc, scm, mocker):
     )
 
 
-@pytest.mark.parametrize(
-    "args, reset", [(["exp", "run"], False), (["exp", "reset"], True)],
-)
-def test_experiments_run(dvc, scm, mocker, args, reset):
+def test_experiments_run(dvc, scm, mocker):
     default_arguments = {
         "params": [],
         "name": None,
@@ -99,11 +96,11 @@ def test_experiments_run(dvc, scm, mocker, args, reset):
         "jobs": None,
         "tmp_dir": False,
         "checkpoint_resume": None,
-        "reset": reset,
+        "reset": False,
     }
     default_arguments.update(repro_arguments)
 
-    cmd = CmdExperimentsRun(parse_args(args))
+    cmd = CmdExperimentsRun(parse_args(["exp", "run"]))
     mocker.patch.object(cmd.repo, "reproduce")
     mocker.patch.object(cmd.repo.experiments, "run")
     cmd.run()