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fix(test): download a valid Volcano CRD for the integration tests

The volcano-crd target built the download URL from the go.mod pseudo-version of
volcano.sh/apis. That commit does not exist in volcano-sh/volcano, so the
request returned a 404 and, because curl ran without -f, the 404 page was saved
as the CRD. envtest then never installed the PodGroup CRD, which made the
Volcano integration specs time out.

Strip the pseudo-version suffix to get the release tag, keep VOLCANO_VERSION
overridable, and use curl -f so an invalid version fails the target instead of
writing a bogus file.

Taken over from #3988 at the maintainers' request, so the integration tests of
this PR are valid. Fixes #3929.

Co-authored-by: DevaanshPathak <devaanshpathak08@gmail.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Signed-off-by: daehyun-kim-94 <daehyun.kim.0613@gmail.com>