fix: auth strategy exp (#6945)

## Description

Ensures that exp and auth strategy are available from the `me` and
`refresh` operations as well as passed through the `Auth` provider. Same
as #6943

- [x] I have read and understand the
[CONTRIBUTING.md](https://github.com/payloadcms/payload/blob/main/CONTRIBUTING.md)
document in this repository.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

test/auth/int.spec.ts

@@ -134,6 +134,8 @@ describe('Auth', () => {
 
         const data = await response.json()
 
+        expect(data.strategy).toBeDefined()
+        expect(typeof data.exp).toBe('number')
         expect(response.status).toBe(200)
         expect(data.user.email).toBeDefined()
       })