[HttpFoundation] Allow dynamic session "ttl" when using a remote storage

[fabpot]

Q	A
Feature PR	symfony/symfony#45873
PR author(s)	@nicolas-grekas
Merged in	6.1

[wouterj]

Hi again @nicolas-grekas :). Do you think this feature needs documentation? I cannot fully follow the code PR and it seems to be quite an advanced edge case? If you think it needs docs, can you please submit a small PR?

[nicolas-grekas]

/cc @Seldaek

[javiereguiluz]

Closing as fixed in #16880. Thanks.