[XPU] Add xpu support of make triton

[Stonepia]

This PR is to add XPU support for make triton.

If a user wishes to use Triton with XPU support, the user needs to install the intel-xpu-backend-for-triton.

This PR allows the user to easily install Triton for xpu backend support:

# clone the pytorch repo
export USE_XPU=1
make triton

The XPU version of triton will always be built from the source. It will cat the commit id from .ci/docker/ci_commit_pins/triton-xpu.txt, for example, b8c64f64c18d8cac598b3adb355c21e7439c21de.

So the final call would be like:

pip install --force-reinstall "git+https://github.com/intel/intel-xpu-backend-for-triton@b8c64f64c18d8cac598b3adb355c21e7439c21de#subdirectory=python"

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/126513

• 📄 Preview Python docs built from this PR
• 📄 Preview C++ docs built from this PR
• ❓ Need help or want to give feedback on the CI? Visit the bot commands wiki or our office hours

Note: Links to docs will display an error until the docs builds have been completed.

✅ No Failures

As of commit f172874 with merge base a60b06b ():
💚 Looks good so far! There are no failures yet. 💚

This comment was automatically generated by Dr. CI and updates every 15 minutes.