lifecycle: erdos.renyi.game() and random.graph.game() soft deprecation

[maelle]

Part of #1508

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[szhorvat]

I suggest keeping erdos.renyi.game() for quite a long time, as there might be a lot of code (not packages, but analysis code, e.g. bundled with research papers) that relies on it. People may get frustrated and complain about reproducibility if the function is removed too early. Note that I'm talking about removal, not deprecation.

As for deprecation, the sooner the better: it's great to see that being done.

As for random.graph.game(), this one has been outdated for a long long time, and it's much less used. I think it can be removed much earlier than erdos.renyi.game().

To be clear, this is based more on hunches than measurements (though you've seen the numbers too from GitHub searches).

[maelle]

Yeah the numbers from GitHub search made me realize it shouldn't go away too soon 😅

[maelle]

but now it's in the lifecycle system so we won't forget about it