Add image replacement for amd64 specific image for entrypoint-resolution test and update docker-in-docker test image for Power.

[Sachin-Itagi]

This includes replacing the amd64/ubuntu image for entrypoint-resolution test and update the docker:dind image in the test examples. this is not multi arch image, so use different image for ppc64le platform.

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As the author of this PR, please check off the items in this checklist:

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Release Notes

NONE

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[khrm]

/kind misc

[Sachin-Itagi]

/retest

[Sachin-Itagi]

/test pull-tekton-pipeline-go-coverage

[chitrangpatel]

/approve

[Sachin-Itagi]

@chitrangpatel Can we proceed with the merge if everything looks good to you. All the checks were successful.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chitrangpatel, vdemeester

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