Fix cluster capacity accumulation for hostless/filtered vms

[NouemanKHAL]

What does this PR do?

• Fix cluster capacity accumulation for hostless/filtered vms

Secondary/Testing improvements:

• Fix host_count/vm_count to reflect actually collected entities instead of all encountered
• Remove unused metrics counters (*_metrics_count, EntityType, entity_type param)
• Centralize test tag constants and assert capacity metrics for all VMs

Motivation

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.03%. Comparing base (fe21317) to head (3bbf90f).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Scope hostless VM capacity to current cluster

The new hostless accumulation is global across all VMs (_build_vms_by_host_cache sums into _hostless_vm_* once) but then those totals are added inside each cluster loop, so every processed cluster receives the same hostless VM capacity. In environments with multiple clusters (or cluster filters), this overcounts capacity and can attribute hostless VMs from excluded/other clusters to the current cluster. Please bucket hostless capacity by vm.cluster.extId (or compute per-cluster) before adding it.

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