Retire attention-mask custom operator

[mcremon-meta]

Summary:
Retire the Jarvis attention-mask custom operator and all confirmed dead scaffolding.

Remove both the ExecuTorch jarvis_nn_ops::attention_mask.out runtime path and the unused eager jarvis_nn_ops::attention_mask wrapper. Delete their generic and HiFi kernels, tests, build targets, registrations, dependencies, and documentation. Remove custom-op-only PYE libraries, the orphan ASR encoder runtime package, unused ASR aggregate/HTP targets, and downstream references while preserving the live Jarvis NN aggregates and lean/non-HTP ASR operator bundles.

Differential Revision: D115805406

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21802

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❌ 2 New Failures

As of commit cde4058 with merge base 43f89fb ():

NEW FAILURES - The following jobs have failed:

• Cadence Build & Test / hifi-build / hifi4 (gh)
  ##[error]Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step.
• Cadence Build & Test / vision-build / vision (gh)
  ##[error]Refusing to check out fork pull request code from a 'pull_request_target' workflow. This workflow runs with the base repository's GITHUB_TOKEN, secrets, default-branch cache scope, and runner access. Fetching and executing a fork's code in that trusted context commonly leads to "pwn request" vulnerabilities. To opt in, review the risks at https://gh.io/securely-using-pull_request_target and set 'allow-unsafe-pr-checkout: true' on the actions/checkout step.

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[meta-codesync]

@mcremon-meta has exported this pull request. If you are a Meta employee, you can view the originating Diff in D115805406.

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