Remove unused cold_start experiment

[wconstab]

Stack from ghstack (oldest at bottom):

• Delete unused static runtime experiment #87473
• Delete unused ts experiment #87472
• Delete unused ltc experiments #87471
• -> Remove unused cold_start experiment #87470
• Make torchbench setup a function #87469

• this --cold_start experiment didn't end up being used
• there is a new --cold_start_latency flag that is used
• this experiment was only hooked up for nvfuser anyway

cc @jansel @lezcano @fdrocha @mlazos @soumith @voznesenskym @yanboliang

[pytorch-bot]

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❌ 2 Failures, 1 Pending

As of commit df1c6bc:

The following jobs have failed:

• cuda11.6-py3.10-gcc7-sm86 / test (default, 1, 4, linux.g5.4xlarge.nvidia.gpu)
• manywheel-py3_7-cuda11_6-build / build

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[wconstab]

@pytorchbot merge

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[pytorchmergebot]

Merge failed

Reason: 2 additional jobs have failed, first few of them are: trunk ,trunk / cuda11.6-py3.10-gcc7-sm86 / test (default, 1, 4, linux.g5.4xlarge.nvidia.gpu)

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[wconstab]

@pytorchbot merge -f "CI is broken, but this is low risk"

[pytorchmergebot]

Merge started

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[github-actions]

Hey @wconstab.
You've committed this PR, but it does not have both a 'release notes: ...' and 'topics: ...' label. Please add one of each to the PR. The 'release notes: ...' label should represent the part of PyTorch that this PR changes (fx, autograd, distributed, etc) and the 'topics: ...' label should represent the kind of PR it is (not user facing, new feature, bug fix, perf improvement, etc). The list of valid labels can be found here for the 'release notes: ...' and here for the 'topics: ...'.
For changes that are 'topic: not user facing' there is no need for a release notes label.