[WIP] Add option to build with all xnnpack, vulkan, qnn

[Copilot]

Plan to add "all" flavor option to android-release-artifacts.yml

• Add "all" as a new flavor option in the workflow_dispatch inputs
• Update the build logic to set up all three backends (xnnpack, vulkan, qnn) when flavor is "all"
• Validate YAML syntax is correct
• Review and verify the changes work correctly

Original prompt

On android-release-artifacts.yml, Add a option to build with all xnnpack, vulkan, qnn

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cc @SS-JIA @manuelcandales @digantdesai @cbilgin

[pytorch-bot]

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