Enable parsing of JSON env vars

[Genyus]

Description

Modifies how environment variables are parsed to avoid JSON parsing errors.

Currently, variable parsing calls show value, but the show function in Haskell automatically adds quotes around strings and escapes internal quotes. So when you have:

PG_BOSS_NEW_OPTIONS={"teamConcurrency":3}

it gets converted to:

PG_BOSS_NEW_OPTIONS="{\"teamConcurrency\":3}"

The value that gets passed to JSON.parse() includes the outer quotes and escaped inner quotes, which is why it fails.

Fixes #2846

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1. Just code/docs improvement (no functional change).
2. Bug fix (non-breaking change which fixes an issue).
3. New feature (non-breaking change which adds functionality).
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