fix ci and add event logging to help debug ci

[JesseStutler]

1. Fix spark ci, add Free Disk Space step
2. Upgrade busybox and nginx image to use latest image, otherwise it will cause image pull failure:

The pod <ypari8nv/qj-1-qj-1-task-0-5> is not in Succeeded phaseEvent related with pod <ypari8nv/qj-1-qj-1-task-0-5>: Failed - Failed to pull image "busybox:1.24": failed to pull and unpack image "docker.io/library/busybox:1.24": no signatures

3. Add event logging for WaitTaskPhase validation, if the phase of pod is not in phase slice, query the events related with it and log, help us to debug ci when ci fails.

[JesseStutler]

/assign @Monokaix

[JesseStutler]

@Monokaix @hwdef Please help have a review.

[SherlockShemol]

Hero! 🌹

[hwdef]

/lgtm

[hwdef]

/ok-to-test

[dongjiang1989]

Great!

[Monokaix]

/lgtm
/approve

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