Update more alerts in mixin to have native histogram alternatives

[zenador]

What this PR does

Add more native histogram versions of alerts using classic histograms in the mixin.

Which issue(s) this PR fixes or relates to

N/A

Checklist

• Tests updated.
• Documentation added.
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]. If changelog entry is not needed, please add the changelog-not-needed label to the PR.
• about-versioning.md updated with experimental features.

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Note

Adds native histogram versions of multiple alerts (KV store, level-1 blocks queried, Kafka delay/processing, ruler remote eval, GEM federation errors) and updates compiled/Helm outputs accordingly.

• Mixin (Jsonnet):
  • Introduce histogramLabels() and refactor alert helpers to emit both classic/native histogram queries.
  • Add native histogram counterparts for:
    • KVStoreFailure, HighVolumeLevel1BlocksQueried (blocks), Kafka ingest-storage alerts (Starting/RunningIngester*, processing failure/stuck), RulerRemoteEvaluationFailing.
    • GEM: GEMFederationFrontendRemoteClusterErrors (classic + native).
• Compiled alerts (mimir, baremetal, GEM) & Helm tests:
  • Generate parallel classic/native rules with appropriate labels (e.g., histogram: native, buckets: custom where applicable) across all affected alerts.
• Changelog:
  • Note change: add more native histogram versions of alerts using classic histograms.

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