@azure/keyvault-certificates_4.8.0-beta.1

[keyvault] Prepare release (#27705)

### Packages impacted by this PR
 
- `@azure/keyvault-admin`
- `@azure/keyvault-certificates`
- `@azure/keyvault-keys`
- `@azure/keyvault-secrets`

### Describe the problem that is addressed by this PR

Prepare for beta release of service version 7.5-preview.1 support