ENG-3651/ENG-3652 Add Prime release e2e checks

[d42me]

Adds a sandbox-backed release e2e workflow for prime env push/install, local eval uploads, and hosted eval submissions before release merges.

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Note

Medium Risk
Adds a new GitHub Action and companion script that uses real API credentials to create sandboxes, push environments, and run/submit hosted evals, so failures could consume resources or affect remote state. Logic is isolated to CI tooling, but it exercises multiple external services and cleanup paths.

Overview
Introduces a new Release E2E Tests GitHub workflow (.github/workflows/release-e2e.yml) that runs on release/* PRs (or manually) and executes release smoke tests inside a Prime sandbox using repo-provided SDKs and configured secrets/vars.

Adds packages/prime/scripts/release_e2e.py, which archives the current checkout (skipping common build artifacts, symlinks, and likely-secret files), provisions a sandbox, installs the candidate CLI from the uploaded source, then validates core flows: prime env push/info/install, local eval runs + eval push, and optional hosted eval submission with configurable wait/cancel behavior and best-effort cleanup.

Includes tests (packages/prime/tests/test_release_e2e_script.py) to ensure archive filtering, remote-script compilation/cleanup behavior, and workflow input handling are correct (and that any old workflow name/path isn’t present).

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