[codex] Cleanup old gateway secret versions

[Pigbibi]

Summary

• destroy older Secret Manager versions after manually syncing gateway secrets from GitHub
• keep only the latest active version per synced secret to avoid version-count cost drift

Validation

• exercised the embedded Python selection logic with a sample payload
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Indent embedded Python inside the run block

In .github/workflows/main.yml, these newly added Python lines are not indented under the run: | block. Because YAML block scalar content must remain indented, rows = json.load(sys.stdin) terminates the shell script and becomes top-level YAML, so GitHub Actions cannot parse/load this workflow when this file is present.

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