In the UI, add metadata field to end user authentication

[noahtalerman]

Goal

User story
As an IT admin,
I want to supply my identity providers metadata XML on the Settings > Integrations > Automatic enrollment page
so that I can configure end user authentication if my IdP doesn't provide a metadata URL (ex. Google Workspace)

Context

• Product designer: @marko-lisica

Changes

Product

• [ ] UI changes: Figma link
• [ ] Outdated documentation changes: Improve End user authentication docs, since now it's confusing. We mention "Configure single sign-on (SSO)" which is related to SSO for admins.

Engineering

• [ ] Database schema migrations: TODO
• [ ] Load testing: TODO

ℹ️  Please read this issue carefully and understand it. Pay special attention to UI wireframes, especially "dev notes".

QA

Risk assessment

• Risk level: Low

Manual testing steps

1. Ensure copy change matches figma for hint and tool tip
2. Ensure validation is in place if fields are left blank or entered incorrectly
   • SSO and Automatic enrollment pages
3. Validate SSO and Automatic enrollment workflows succeed.

Testing notes

Confirmation

1. [ ] Engineer (@____): Added comment to user story confirming successful completion of QA.
2. [ ] QA (@____): Added comment to user story confirming successful completion of QA.

[zhumo]

Removing from the product board because it will likely not be designed and shipped <=6 weeks.

[gillespi314]

Moving this back to "Ready" because the PR needs to be updated for the new ABM settings page.