When using `event_manager` to initialize the crawler, the global `event_manager` doesn't work.

[Mantisus]

If event_manager is passed as an initialization parameter to BasicCrawler, the global event_manager in service_locator will never be started.

https://github.com/apify/crawlee-python/blob/master/src/crawlee/crawlers/_basic/_basic_crawler.py#L770-L778

As a result, classes that use service_locator.get_event_manager() do not behave as expected, because they do not receive the relevant events.

Classes affected by this issue: Snapshotter and RecoverableState.

Related: #1805

Also, if two crawlers share the global event_manager and one finishes before the other, the event_manager will be shut down for the second crawler as well.

[Mantisus]

At this point, I don't see a workaround that won't break in edge cases without breaking changes in the signatures of public classes.

Folks @janbuchar, @vdusek, @Pijukatel, any ideas welcome.