fix(ci): skip duplicate hdp-autogen PyPI publishes

[asiridalugoda]

Summary

• add skip-existing: true to the publish-hdp-autogen PyPI step
• prevent duplicate uploads of the same immutable PyPI version from failing the deployment environment
• leave the actual hdp-autogen package and versioning unchanged

Context

• pypi-hdp-autogen failed because hdp-autogen 0.1.2 had already been published successfully and a later duplicate publish attempt received HTTP 400
• the live PyPI package was already healthy; this change makes retries of the same version idempotent

Verification

• validated .github/workflows/release.yml as YAML
• confirmed hdp-autogen 0.1.2 is already live on PyPI
• reconciled the latest failed deployment entry with a success status pointing to the already-successful release job