Propagate dump_systemd_journal to logexporter job.

[mm4tt]

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:

Propagates the dump_systemd_journal flag to the log exporter tool.
Log exporter changes have been made in kubernetes/test-infra#11121 and the new version has been pushed in kubernetes/test-infra#11149

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @mm4tt. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mm4tt]

/assign @mborsz
/assign @wojtek-t

[wojtek-t]

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mm4tt, wojtek-t

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[mm4tt]

/test pull-kubernetes-e2e-gce

[mm4tt]

/test pull-kubernetes-e2e-gce-100-performance