fix(bruno): keep generated values in runtime scope

[Yurii201811]

Changes proposed in this pull request

• Keep values generated by the Rafiki Bruno collection in runtime scope instead of persisting them to environment files.
• Read generated values from runtime scope, while preserving the configured assetId fallback used by the Local Playground environments.

Context

Bruno v4 persists bru.setEnvVar() changes to disk by default. The affected values are generated for the current collection run, and some are access or continuation tokens, so they should stay in runtime scope.

Fixes #3948

Verification

• pnpm dlx prettier@3.2.5 --check bruno/collections/Rafiki
• node --check bruno/collections/Rafiki/scripts.js
• Confirmed no bru.setEnvVar(), bru.deleteEnvVar(), or bru.setGlobalEnvVar() calls remain in the Rafiki collection.
• Confirmed all changed files are under bruno/collections/Rafiki/.

Checklist

• Related issues linked using fixes #number
• Tests added/updated
• Make sure that all checks pass
• Bruno collection updated (if necessary)
• Documentation issue created with user-docs label (if necessary)
• OpenAPI specs updated (if necessary)

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