Change repository name from 'pytorch' to 'executorch'

[nil-is-all]

Change as part of automation for PyTorch Docathon

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 68390ad with merge base 93b764e ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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