Do not run lintrunner init in lintrunner CI job

[swolchok]

Two reasons:

1. It will end up spamming pip install -r requirements-dev.txt once for each linter because of the way we have init commands set up. This is fixable, but:
2. setup_linux sets up lintrunner for us already anyway via install_requirements.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> Do not run lintrunner init in lintrunner CI job #14263

[pytorch-bot]

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⏳ No Failures, 24 Pending

As of commit acd1eb4 with merge base e6b9111 ():
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[swolchok]

hmm, this is not much if any faster, guess the split jobs were a good idea and so is not running on all files