Add OPERATOR_NAME env var in .generated files for operator

[viveksinghggits]

Summary

As part of one of the recent changes #222 we added a new env var OPERATOR_NAME. After switching the context this env var was correctly populated in the generated files context.env and context.export.env but it was not being populated in the other generated files (context.operator.env and context.operator.export.env). This PR fixes that.

Proof of Work

Switch context either using make switch context=<context> or make switcht and make sure the operator name is populated in the generated files (context.env, context.export.env, context.operator.env and context.operator.export.env).

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[m1kola]

Thanks for handling this!