SHS-5811: Add logout button to sites

[codechefmarc]

READY FOR REVIEW

Summary

• Adds a temporary composer.json change for adding a forked version of the stanford_samlauth module that adds logout button functionality. (This change needs to be reverted before merge!)
• Adds classes to the logout button to match login button

Need Review By (Date)

2024-09-07

Urgency

low

Steps to Test

1. Login to the site as an admin
2. Visit the Block layout page Block page: /admin/structure/block
3. Click "Place block" in the footer region
4. Choose the "SAML SUNetID Logout Block"
5. Do not display the title, then click "Save Block"

6. Verify on the front-end, while logged in, that there is now a logout button

7. Click o the logout button and verify that it correctly logs you out of the site

PR Checklist

• PR Checklist
• Humsci Basic PR Checklist

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[codechefmarc]

@joegl - Adding you in here for review. Other PR for the forked repo is here: SU-SWS/stanford_samlauth#21

[ahughes3]

@joegl I added a comment - SU-SWS/stanford_samlauth#21 (comment) on the stanford_samlauth PR.

There was a comment that we needed clarification on: Since this is a "Login Block", it think it would be better to use a new block plugin.

@codechefmarc wasn't sure if this meant he needed to create a new block for logout as the original plan was to do everything in that block plugin.

I didn't know if it was more of a naming convention issue or a best practice/functionality issue. If the functionality works could updating the naming of the block to SamlLoginLogutBlock cover the concerns?

[ahughes3]

Update from Mike - We can change the name of the file & class but, it's not an option to change the ID of the block plugin. This would cause cascading issues on every platform that uses the module and block.
Because the block id is login, it is best to create a logout block. you can almost copy the current block plugin and just reverse the access condition and display a logout button instead.

[codechefmarc]

@cienvaras - Updated this PR with the latest code to split the logout block into its own plugin and ready for review.