Update Android artifact naming and version to 1.2.0-SNAPSHOT

[Copilot]

Summary

Applies artifact naming change from #16806 to main branch: treats xnnpack as the default flavor, producing executorch-android without suffix. Other flavors (e.g., qnn) retain the -<flavor> suffix. Updates default version to 1.2.0-SNAPSHOT.

Before:

coordinates(..., execuTorchVersion ?: "1.0.0-SNAPSHOT")
// flavor="xnnpack" → executorch-android-xnnpack
// flavor="qnn" → executorch-android-qnn

After:

coordinates(..., execuTorchVersion ?: "1.2.0-SNAPSHOT")
// flavor="xnnpack" → executorch-android
// flavor="qnn" → executorch-android-qnn

Test plan

Changes are to Gradle configuration only. Artifact naming will be validated through Maven Central publishing workflow.

Original prompt

Apply change in https://github.com/pytorch/executorch/pull/16806/changes extension/android/executorch_android/build.gradle to main branch. version should be 1.2.0-SNAPSHOT though.

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16846

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❌ 4 New Failures, 2 Unrelated Failures

As of commit d8251f8 with merge base 2d6c2ef ():

NEW FAILURES - The following jobs have failed:

• Build Presets / linux (pybind, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
• pull / android / build-llm-demo / linux-job (gh)
• pull / test-llama-runner-linux (bf16, custom, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh)
  RuntimeError: mmap can only be used with files saved with torch.save(stories110M.pt, _use_new_zipfile_serialization=True), please torch.save your checkpoint with this option in order to use mmap.`
• Test CUDA Builds / export-model-cuda-artifact (google, gemma-3-4b-it, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 179cfe62af4ff6db49860c9cf9023d6cdbd7f35bdcfcb938b18bbfd14bbcfb61 /exec failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• periodic / test-models-linux (cmake, mv3, xnnpack-quantization-delegation, linux.2xlarge, 90) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (mv2, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[Copilot]

Pull request overview

This PR updates the Android artifact naming convention to treat xnnpack as the default flavor (producing executorch-android without suffix) and updates the default version to 1.2.0-SNAPSHOT. This change aligns the main branch with the artifact naming modifications from PR #16806.

Changes:

• Modified artifact naming logic to exclude the -xnnpack suffix, making it the default flavor
• Updated default version from 1.0.0-SNAPSHOT to 1.2.0-SNAPSHOT

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