test: use vanilla busybox image for E2E tests

[jackfrancis]

Reason for Change:

This is more resilient across clouds, e.g., china

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[mboersma]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

Merging #2544 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2544   +/-   ##
=======================================
  Coverage   72.12%   72.12%           
=======================================
  Files         130      130           
  Lines       24468    24468           
=======================================
  Hits        17647    17647           
  Misses       5799     5799           
  Partials     1022     1022