Andrei Kvapil d8f5083c6d fix(monitoring-agents): use global.clusterDomain for FQDN resolution (#2086)
## What this PR does

PR #2075 introduced `_cluster.cluster-domain` references in
monitoring-agents `values.yaml` for FQDN resolution in tenant clusters.
This broke the fluent-bit subchart because `_cluster` values are not
accessible from the Helm subchart context — only `global` values are
shared with subcharts.

This PR replaces `_cluster` references with a new `global.clusterDomain`
variable:
- Empty by default (management cluster uses short DNS names like
`service.namespace.svc`)
- Set to the management cluster domain (e.g. `cozy.local`) for tenant
clusters, enabling FQDN resolution for cross-cluster service discovery

Fixes #2084

### Release note

```release-note
[system] Fix monitoring-agents installation failure caused by inaccessible _cluster values in fluent-bit subchart context. Introduce global.clusterDomain for proper FQDN resolution in tenant workload clusters.
```

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

* **Chores**
* Monitoring agent configuration updated to support configurable cluster
domain names for greater flexibility.
* Remote write and log-forwarding endpoints adjusted to align with
cluster domain handling, improving compatibility when deploying across
different cluster DNS setups.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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