in DX Core, one instance = one environment
review impl for potential code simplification

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Ideally, remove usages (and classes) for:

• EnvironmentsClientBuilder and whole package info.magnolia.config.environment
• EnvironmentContextPerThread

Assess the amount of modules / code locations that need to be reverted to 6.2 state (more or less)

• e.g. consider revertin MGNLREST-304 Support configuration environments in delivery endpoints