RavenDB-19163: Dispose CertificateHolder.Certificate on RavenServer dispose

[ArieSLV]

Issue link

https://issues.hibernatingrhinos.com/issue/RavenDB-19163/Dispose-CertificateHolderCertificate-on-RavenServer-dispose

Additional description

CertificateHolder.Certificate should be disposed of on RavenServer disposing of.

Type of change

• Optimization

How risky is the change?

• Low

Backward compatibility

• Non breaking change

Is it platform specific issue?

• No

Documentation update

• No documentation update is needed

Testing

• It has been verified by manual testing

Is there any existing behavior change of other features due to this change?

• No

UI work

• No UI work is needed