Ensure SSH keys are cleaned up from the DO e2e test account

[timoreimann]

For every CI run, we create a new SSH key and upload it to the DO e2e test account in the e2e script. Although we do also set up a bash trap to ensure proper cleanup, there are some left-over keys in our account. This is presumably due to test jobs that got killed hard enough so that the trap did not have a chance to fire.

We should come up with a way to guarantee that those keys are eventually cleaned up. Two possible approaches (but more may exist):

1. Ensure the e2e test timeout is lower than whatever timeout the CI may have to make sure we can terminate gracefully.
2. Extend the existing janitor job to also cover keys.

[timoreimann]

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[timoreimann]

/remove-lifecycle stale

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[palnabarun]

/remove-lifecycle rotten

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[cpanato]

/remove-lifecycle stale

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[cpanato]

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

[timoreimann]

/remove-lifecycle rotten