Redirect to end_session_endpoint for idp_initiated logon when it is configured

[MarcialRosales]

Proposed Changes

Addresses #12545

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)
• Build system and/or CI

[MirahImage]

Can this be backported to 4.0 as well?

[michaelklishin]

@MirahImage from the looks of it, all these changes are node-local so, I'd say, yes.

[MarcialRosales]

Yes @MirahImage It can be merged back to 4.0.x. I will test the back-port given there seems to be a customer waiting for it.

[michaelklishin]

Rebased on top of main.

[michaelklishin]

Because of the rebase it must be backported manually.

[michaelklishin]

@MarcialRosales I had to revert this PR because the Selenium suite fails repeatedly with certain configurations.