Fix Issue 6430: add proxy_env definition to remove_node.yml

[nniehoff]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Fixes issue #6430 where proxy_env is missing from remove_node.yml

Which issue(s) this PR fixes:

Fixes #6430

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[nniehoff]

/assign @ant31

[floryut]

/ok-to-test

[Miouge1]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Miouge1, nniehoff

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[floryut]

/lgtm