Add RelayState Customizer to SAML Logout

[ghaege]

Add RelayState Customizer to SAML Logout

Closes gh-12538

[jzheaux]

Thanks, @ghaege! I appreciate the contribution, and sorry that it took me a bit to get back to you. I've left some feedback inline. When you submit your update, please squash your commits into a single one.

In addition to that, please have that single commit include the bug that it being closed, like so:

Your Commit Title

Closes gh-12538

Thanks!

[ghaege]

Thanks, @jzheaux for your feedback.
But since your recommendations are mainly by "polishing-nature and spring internal rules" and I don't have time, I would like to ask you to do the changes.

Thanx for your understanding.

[jzheaux]

Thanks, @ghaege. No problem, we'll make sure this gets in.

To keep each commit atomic, I am going to need to split the unrelated cleanups into a separate commit. This will remove your authorship, and I want to make sure you get credit. So, what I propose is that I will instead add the relay state feature myself and add you as a co-author in the commit message. Does that sound okay to you? I'll go ahead and proceed this way if I don't hear from you in the next few days.

If you want to resubmit the cleanups once you have time again, then you can always rebase your gh-12538 branch with main and resubmit the PR.

[ghaege]

Perfect - do it like you proposed.