Add end user's IdP information to host vitals

[noahtalerman]

Goal

User story
As an IT admin,
I want to add end user's info (e.g. email, username, role, department) from the identity provider (IdP) to host vitals
so that I can identify which end user is assigned to each host.

Key result

Fleet users can add host vitals from their IdP as variables in configuration profiles

Original requests

#21028

Context

• Product designer: @marko-lisica

@marko-lisica: LDAP research document

Changes

Product

• UI changes: Figma link
• CLI (fleetctl) usage changes: No changes.
• YAML changes: No changes.
• REST API changes: [API changes] Add end user's IdP information to host vitals #23839
• Fleet's agent (fleetd) changes: No changes.
• Activity changes: TODO
• Permissions changes: TODO
• Changes to paid features or tiers: Available in Fleet Premium only.
• Other reference documentation changes: No changes.
• Once shipped, requester has been notified

Engineering

• Feature guide changes: [User guide] Add end user's IdP information to host vitals #23901
  • Includie steps on how to test the connection and user attributes mapping
• 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

• Requires load testing: TODO
• Risk level: Low / High TODO
• Risk description: TODO

Manual testing steps

1. Step 1
2. Step 2
3. Step 3

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.

[noahtalerman]

Hey @marko-lisica, left some feedback in a Loom video here.

[nonpunctual]

related: #21028