Moved build-release automation to valkey-release-automation (#1977)

All the Valkey Release automation has been moved and setup here:
https://github.com/valkey-io/valkey-release-automation

The release automation will now be triggered from the
[trigger-build-release.yml](https://github.com/valkey-io/valkey/blob/unstable/.github/workflows/trigger-build-release.yml)
workflow.

Need to remove these files to stop duplicating push to the s3 bucket.

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Signed-off-by: Roshan Khatri <rvkhatri@amazon.com>

Author: roshkhatri