Dynamic SCEP challenges for Okta certs

[zayhanlon]

Goal

User story
As an IT admin who uses Okta as a CA,
I want to deploy Okta certificates with dynamic challenges
so that I can have a unique challenge (secret) per enrollment.

Changes

Product

• UI changes: Figma wireframes
• CLI (fleetctl) usage changes: No changes
• YAML changes: No changes
• REST API changes: No changes
• Fleet's agent (fleetd) changes: No changes
• GitOps mode UI changes: No changes
• GitOps generation changes: No changes
• Activity changes: No changes
• Permissions changes: No changes
• Changes to paid features or tiers: Fleet Premium
• My device and fleetdm.com/better changes: No changes
• Usage statistics: No changes
• Other reference documentation changes: No changes
• First draft of test plan added
• Once shipped, requester has been notified
• Once shipped, dogfooding issue has been filed

Engineering

• Test plan is finalized
• This is a premium only feature: Yes

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

QA

Risk assessment

• Risk level: Low

Test plan

Make sure to go through the list and consider all events that might be related to this story, so we catch edge cases earlier.

1. Add CA modal: Verify that all text changes from Figma are present.
2. CA list: Verify that text changes from Figma are present.
3. Edit CA modal: Verify that all text changes from Figma are present. (In the designs, these are in the "Add" modal.)

Testing notes

Confirmation

1. Engineer: Added comment to user story confirming successful completion of test plan.
2. QA: Added comment to user story confirming successful completion of test plan.