refactor!: Don't parse resolv.conf for cluster domain auto-detection

[sbernauer]

Description

Basically reverts #893 (and #895).
Instead we have no auto-detection and only have a config option (via env var and CLI arg) - if not specified we default to cluster.local.
Also this PR moves from a OnceLock to a KubernetesClusterInfo struct, which is passed around in operators to avoid implicit knowledge about call-orders.

We will create a discussion to decide on the auto-detection.

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1. Changes are OpenShift compatible
2. CRD changes approved
3. Integration tests passed (for non trivial changes)

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1. Code contains useful comments
2. (Integration-)Test cases added
3. Documentation added or updated
4. Changelog updated
5. Cargo.toml only contains references to git tags (not specific commits or branches)

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1. Feature Tracker has been updated
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[NickLarsenNZ]

LGTM