Create policies automatically for custom packages

[marko-lisica]

Goal

User story
As an IT admin,
I want to add a custom package and have Fleet create policy automatically
so that I can deploy software to all my hosts w/o having to write a policy.

Objective

• Mission critical app management #22616

Context

• Product designer: @marko-lisica

Changes

Product

• UI changes: Figma link
• CLI (fleetctl) usage changes: No changes.
• YAML changes: No changes.
• REST API changes: No changes.
• Fleet's agent (fleetd) changes: No changes.
• Activity changes: No changes.
• Permissions changes: Permissions changes: No permissions changes. Software add/edit/remove permissions are already specified in the permissions guide.
• 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: TODO
• 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.