go schema generator fails when generating formatted string fields

### What happened?

My XRD Shema defines an email formatted string arrayfield.
This field is generated as `*[]openapi_types.Email`

Using this formats, the generated schema files will not compile due to 2 issues.

1. the import `openapi_types "github.com/oapi-codegen/runtime/types"` is missing
2. the openapi_types.Email does not implement the `DeepCopyInto` func

### How can we reproduce it?

Create a XRD defining a string array field with format email.

```yaml
members:
type: array
description: Member principal namees for the group
items:
type: string
format: email
pattern: '^[^@\s]+@[^@\s]+\.[^@\s]+$'
```

Put the XRD into apis/my-yrd/definition.yaml

Run `crossplane project build`

### What environment did it happen in?

* Crossplane CLI version: v2.5.0
* Platform (e.g., linux/amd64): linux/amd64
* Crossplane version (if applicable): not relevant

Reproduce the issue by placing the shown XRD in apis/my-yrd/definition.yaml and running `crossplane project build`. Inspect the Go schema generator and its generated schema output for the formatted email array field. Done means the generated files compile, include the required runtime import, and handle the generated Email type's DeepCopyInto requirement.

Written by the indexing model from the issue text.