[HttpFoundation] Do not return an empty session id if the session was closed

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7936 
| License       | MIT
| Doc PR        | ~

A regression from the bug fix #9246 was introduced due to an incomplete fix ;

As the `started` flag on the NativeSessionStorage was not `true` anymore when saving the session, the session id was always empty when saving it, and thus when sending the `PHPSESSID` cookie.

The previous PR I made (#9530) was another approach to solve this regression, but this one should keep the fix made by @tecbot on #9246, and finish it with another verification. I may miss another place where `started` is used, but I don't really see which other conditions depending on this property should be altered...

**Note : this is #9611 rebased on 2.2**

This should be mergeable.