Update TestSpawner_CreateJobDeleteJob

[reductionista]

This is one step toward removing ocr2vrf from the codebase.

Replaces the example ocr2vrf job spec used in TestSpawner_CreateJobDeleteJob with an ocr2keeper job spec

While working on this, I noticed two minor issues with the cleanupEVM helper called by the OCR2 job delegate's OnDeleteJob callback.

1. Only Keepers 2.0 jobs were unregistering their LogPoller filters. Keepers 2.1 jobs were registering filters but never unregistering them.
2. Fix typo & formatting of log msg

[github-actions]

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