Enable dump GKE node logs

[saikat-royc]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
Capturing the flow here:
This patch uses kubetest --dump flag instead of directly setting up --report-dir flag. If dump flag is provided, kubetest will setup report-dir here. Also using dump flag, enables kubetest to call DumpClusterLogs for both GCE and GKE deployments. For GKE, the function will setup the enviroment variables and filters here. For GKE deployment, this enables log-dump.sh to find the node names for GKE and also gracefully skip master dump. The above dump flag works for both zonal and regional GKE clusters.

Also with this change, we do not need the change kubernetes/kubernetes#95088. I will be closing that PR once this one is reviewed.
Does this PR introduce a user-facing change?:

Enable dump GKE node logs

[saikat-royc]

/cc @tosi3k @msau42

[k8s-ci-robot]

@saikat-royc: GitHub didn't allow me to request PR reviews from the following users: tosi3k.

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/cc @tosi3k @msau42

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[saikat-royc]

/cc @verult

[tosi3k]

I'm not sure whether I'm an appropriate person for reviewing this PR given I don't own this code but OTOH I was the one that suggested that fix :D.

/lgtm

[k8s-ci-robot]

@tosi3k: changing LGTM is restricted to collaborators

In response to this:

I'm not sure whether I'm an appropriate person for reviewing this PR given I don't own this code but OTOH I was the one that suggested that fix :D.

/lgtm

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[msau42]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42, saikat-royc

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