Download bpftool to a file before extracting in e2e tests

[OguzPastirmaci]

What type of PR is this?

/kind failing-test

What this PR does / why we need it:

The e2e tests downloaded bpftool anonymously inside the cluster in two places: on the kind node and in the test pod. These downloads fail when the GitHub release CDN returns errors to shared runner addresses, which failed the bpf tests (for example this run). An earlier version of this PR kept the in-cluster downloads and added retries, and CI failed the same way.

This version removes the in-cluster downloads. The bats workflow downloads bpftool once on the runner with an authenticated gh release download, with retries and --clobber. The tests copy the binary into the kind node with docker cp and into the test pod with kubectl cp. Local runs without a token keep a curl fallback. Verified green on a fork run of the bats workflow.

Which issue(s) this PR is related to:

None

Does this PR introduce a user-facing change?

NONE

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[kubernetes-prow]

Hi @OguzPastirmaci. Thanks for your PR.

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[gauravkghildiyal]

/ok-to-test
/retest

[gauravkghildiyal]

Thanks @OguzPastirmaci

/lgtm
/approve

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauravkghildiyal, OguzPastirmaci

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