Add Blueprints to Team Library

### Epic

_No response_

### Description

**As a user**

**I want to add blueprints to the Team Library**

**So that I can deploy any flow or partial flow to any new or existing instance**

The initial motivation behind this is achieving partial flow deployment, as described here: https://github.com/FlowFuse/flowfuse/issues/6294

But if users can add custom Blueprints to the Team Library, this goal may be partly achieved, as users will be able to define a flow as a Blueprint, add it to the Team Library, and deploy it wherever they wish, including in a pipeline.

### Which customers would this be available to

None

### Acceptance Criteria

- [ ] criteria 1
- [ ] criteria 2
- [ ] criteria 3
- ...

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate