Expire from time of session creation - generally available

What does this MR do and why?

Expire from time of session creation - generally available

We remove the session_expire_from_init feature flag and make the Expire from time of session creation option generally available.

Changelog: added

References

• Closes #471679 (closed)

Screenshots or screen recordings

No changes:

How to set up and validate locally

The option above should always be available in https://gdk.test:3443/admin/application_settings/general#js-account-settings

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