Android: Add Tensor.ones() and Tensor.zeros() factory methods

[shubham0204]

Fixes #15125

Release notes: misc

Summary

• Add implementation and test for a new factory method Tensor.ones() in the android extension

Test plan

The following new JUnit tests were added to verify the behavior of Tensor.ones() in extension/android/executorch_android/src/test/java/org/pytorch/executorch/TensorTest.kt

• testOnes_DTypeIsFloat

cc @kirklandsign @cbilgin

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15388

• 📄 Preview Python docs built from this PR

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

❌ 3 New Failures, 2 Unrelated Failures

As of commit 4c6d19d with merge base 7ce78c0 ():

NEW FAILURES - The following jobs have failed:

• Lint / android-java-format / linux-job (gh)
  RuntimeError: Command docker exec -t 48cdee9ae2c34a03904d23d83815a8eea33f478325e992b0e855be6646521719 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 3d1f77a61d4cf8cf9a757a5fcf3217c96cb666e8ad4edf5c6332757d43c20efb /exec failed with exit code 1
• Test Metal Backend / export-voxtral-metal-artifact / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 127

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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

[shubham0204]

@pytorchbot label "release notes: misc"