Remove NODE_AUTH_TOKEN from stable-release workflow

[sestinj]

Removed NODE_AUTH_TOKEN environment variable from various steps in the stable release workflow.

Description

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• [] The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Switch the stable-release workflow to OIDC-based npm auth and remove step-level NODE_AUTH_TOKEN usage. This reduces secret exposure and supports provenance-enabled publishing.

• Refactors
  • Added id-token: write permission to the workflow.
  • Removed NODE_AUTH_TOKEN from find_beta, download/verify beta, and publish steps.

^{Written for commit 966ffe9. Summary will update on new commits.}