Field `Actor_is_any_instance_initialized` is not reset correctly after exiting Actor context

[vdusek]

When entering an Actor context, exiting it, and then entering it again, the Actor._is_any_instance_initialized flag is not reset. As a result, a warning is logged even though the context should be cleanly re-initialized.

[apify] WARN  Repeated Actor initialization detected - this is non-standard usage, proceed with care.

I noticed this when adding support for "Run on Apify" for SDK docs to example-code-runner-py (PR).

[Pijukatel]

Btw. is there any real use case for re-entering the Actor context?

[vdusek]

Btw. is there any real use case for re-entering the Actor context?

There is, in the example-code-runner-py for running SDK code examples, see https://github.com/apify/example-code-runner-py/blob/master/src/main.py#L96.