Add ExitCommandDelay configuration use in API exec handler

[NO NEW TESTS NEEDED]

Signed-off-by: Rover van der Noort <s.r.vandernoort@student.tudelft.nl>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f