Prior to this commit, the `SimpleApplicationEventMulticaster` would be
instrumented with the `ApplicationStartup` and start/stop events for
invoking event listeners (`spring.event.invoke-listener`).
This feature was already limited to single-threaded event publishers,
but is still flawed since several types of events can happen
concurrently. Due to the single-threaded nature of the startup sequence,
our implementation should not produce startup events concurrently.
This can cause issues like gh-26057, where concurrent events lead to
inconcistencies when tracking parent/child relationships.
This commit removes the `spring.event.invoke-listener` startup event as
a result.
Fixes gh-26057
4337d8465c