Deleted feature flag from codebase

Smriti Gargrequested to merge
smriti-553931/remove_ff_saml_timeout_supplied_by_idp_override into master

What does this MR do and why?

Deleted feature flag from codebase

Removed FF saml_timeout_supplied_by_idp_override from codebase. Since this FF is enabled in production since more than 3 weeks now we can remove the same from code

Changelog: removed

Solves issue - #553931 (closed)

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