Configuration of certificate validation for RA profile

[lubomirw]

1. Add new properties to RA profile entity that can be used to configure certificate validation for that RA profile:

• validationEnabled - [boolean] if validation should be run on certificates of RA profile
• validationFrequency - [nullable int] how often should validation be run (in days), null = use default platform setting for certificate validation
• expiringThreshold - [nullable int] when certificate is considered as Expiring (in days), null = use default platform setting for certificate expiring threshold (30 days)

2. Update mapping to DTO to set new properties
3. Update platform settings
4. Update scheduled certificate validation system job to reflect certificate validation configuration

• when certificate has RA profile, use its configuration if present, or use default platform settings
• otherwise for certificates without RA profile, use default platform settings
• validation of certificate can be also triggered manually by calling /certificates/{uuid}/validate endpoint