[build] Update DRBD to 9.2.18

[IvanOgurchenok]

Description

This PR updates the DRBD kernel module version from 9.2.16 to 9.2.18.

The default internal drbdVersion value is updated for both CE and EE configuration schemas so new installations and generated module values use the same DRBD version as the build configuration.

Why do we need it, and what problem does it solve?

The module should test and use DRBD 9.2.18 instead of 9.2.16. This keeps the packaged DRBD kernel module aligned with the target version for validation and future rollout.

What is the expected result?

After applying this change:

• DRBD image build uses the drbd-9.2.18 branch from the configured DRBD source repository.
• Default module values expose drbdVersion: "9.2.18" for CE and EE.
• Nodes should install or wait for DRBD 9.2.18 according to the existing module installation flow.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.