Terminate ec2 instance runner after e2e tests

[g-gaston]

Description of changes

Instead of waiting for the job to clean the up, we now terminate the instance immediately. All logs and tests artifacts should already be uploaded by this time, that should be our tool to debug tests.

The main benefit here is we avoid lingering instances that might still be running something (like a kind cluster) that could keep hitting the infra APIs, which could overwhelm them if too many are doing that at the same time. This gets even worse when they overlap with the next test run.

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[g-gaston]

/cherry-pick release-0.17

[eks-distro-pr-bot]

@g-gaston: once the present PR merges, I will cherry-pick it on top of release-0.17 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.17

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01% 🎉

Comparison is base (f76d5f3) 75.62% compared to head (3989056) 75.64%.
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6713      +/-   ##
==========================================
+ Coverage   75.62%   75.64%   +0.01%     
==========================================
  Files         473      474       +1     
  Lines       38155    38303     +148     
==========================================
+ Hits        28854    28973     +119     
- Misses       7703     7723      +20     
- Partials     1598     1607       +9     

see 8 files with indirect coverage changes

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[g-gaston]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: g-gaston

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[eks-distro-pr-bot]

@g-gaston: new pull request created: #6714

In response to this:

/cherry-pick release-0.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.