Andrei Kvapil 8162e3828e [linstor] Fix DRBD+LUKS+STORAGE resource creation failure (#2072)
## What this PR does

Adds the `skip-adjust-when-device-inaccessible.diff` patch (upstream
[LINBIT/linstor-server#477](https://github.com/LINBIT/linstor-server/pull/477))
which:

- Skips DRBD adjust and .res file regeneration when child layer devices
are inaccessible (fixes encrypted resource deletion)
- Skips lsblk when device path doesn't physically exist yet (fixes race
condition after drbdadm adjust)
- Only checks child devices when disk access is actually needed (allows
network reconnect from StandAlone)
- Fixes missing `setExists(true)` in `LuksLayer` — the root cause of all
new DRBD+LUKS+STORAGE resources failing with "not defined in your
config"

### Release note

```release-note
[linstor] Fix DRBD+LUKS+STORAGE resource creation: all new encrypted volumes were failing because the DRBD .res file was never written due to a missing exists flag in the LUKS layer
```

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved handling of inaccessible storage devices by adding pre-checks
before performing operations
* Operations are now skipped when underlying storage devices are
unavailable, preventing unnecessary failures
* Enhanced error recovery during storage adjustments when devices are
temporarily inaccessible

<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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