helpers/helm: skip img-puller namespace in Hyper-V webhook

[rzlink]

What this PR does / why we need it

The e2e suite's img-puller namespace (created by test/e2e/e2e.go::prepullImages) runs DaemonSets that prewarm the Windows test images on every Windows worker. The Hyper-V webhook currently injects runhcs-wcow-hypervisor into these puller pods, turning each one into a Hyper-V UVM that holds ~500 MiB of host memory for the entire suite duration — and in practice deadlocks --prepull-images=true at SynchronizedBeforeSuite.

This PR adds a namespaceSelector that excludes namespaces labeled e2e-framework=img-puller (the label framework.CreateTestingNS sets on that namespace).

Verification

Validated on a CAPZ Hyper-V cluster (WS2025, k8s v1.37.0-alpha): a full hyperv-serial-slow run with --prepull-images=true now completes SynchronizedBeforeSuite in 76 s instead of deadlocking, and img-puller pods admit with no runtimeClassName.

Release note

NONE

[k8s-ci-robot]

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[rzlink]

/assign @mboersma @zylxjtu @Liunardy

[marosset]

/ok-to-test

[marosset]

/approve
/assign @zylxjtu

[zylxjtu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marosset, rzlink, zylxjtu

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