[scripts] Verify artifact integrity when downloading (#32728)

Uses https://cli.github.com/manual/gh_attestation_verify to verify that
the downloaded artifact matches the attestation generated during the
build process in runtime_commit_artifacts.

Example:

On a workflow run of runtime_build_and_test.yml with no attestations:
```
$ scripts/release/download-experimental-build.js --commit=ea5f065745b777cb41cc9e54a3b29ed8c727a574

Command failed: gh attestation verify artifacts_combined.zip --repo=facebook/react

Error: failed to fetch attestations from facebook/react: HTTP 404: Not Found (https://api.github.com/repos/facebook/react/attestations/sha256:7adba0992ba477a927aad5a07f95ee2deb7d18427c84279d33fc40a3bc28ebaa?per_page=30)
`gh attestation verify artifacts_combined.zip --repo=facebook/react` (exited with error code 1)
```

On one which does:

```
$ scripts/release/download-experimental-build.js --commit=12e85d74c1c233cdc2f3228a97473a4435d50c3b

✓ Downloading artifacts from GitHub for commit 12e85d74c1c233cdc2f3228a97473a4435d50c3b) 10.5 secs
An experimental build has been downloaded!

You can download this build again by running:
  scripts/download-experimental-build.js --commit=12e85d74c1c233cdc2f3228a97473a4435d50c3b
```
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/facebook/react/pull/32728).
* #32729
* __->__ #32728