[release-1.15] rearrange parallelism in AKS machine pool e2e tests

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #4874

/assign nojnhuh

NONE

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.00%. Comparing base (898a8e3) to head (2a44f07).
Report is 1 commits behind head on release-1.15.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.15    #4877      +/-   ##
================================================
- Coverage         62.01%   62.00%   -0.02%     
================================================
  Files               201      201              
  Lines             16861    16861              
================================================
- Hits              10456    10454       -2     
- Misses             5622     5624       +2     
  Partials            783      783              

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[nojnhuh]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: fd43dd336de8595c29cfd84ad595cddf01017d52

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nojnhuh

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