rename top-level install_requirements.{py,sh,bat} to install_executorch

[swolchok]

Call it what it does. I did an automated find/replace for the easy cases in scripts/docs and then manually checked the rest.

[swolchok]

Stack from ghstack (oldest at bottom):

• don't touch CMAKE_BUILD_ARGS in install_executorch.py #7716
• Add install_requirements.{sh,py} that only install requirements #7715
• -> rename top-level install_requirements.{py,sh,bat} to install_executorch #7708

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7708

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures

As of commit 86e9c74 with merge base ce77ee7 ():

NEW FAILURES - The following jobs have failed:

• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3df0322bb184324ba923e411808643903c8a852ccc03e614f3f652f1da0100e0 /exec failed with exit code 2
• trunk / test-models-macos (cmake, emformer_transcribe, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  RuntimeError: Missing out variants: {'quantized_decomposed::quantize_per_tensor', 'quantized_decomposed::dequantize_per_tensor'}

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[swolchok]

the two failing jobs are broken on main. merging.