Parameterize BASE_IMAGE on s2i tasks

[sveno1990]

Changes

The changes are follow-ups on #2397

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Release Notes

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Hi @sveno1990. Thanks for your PR.

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[pratap0007]

/ok-to-test

[jkandasa]

@sveno1990 thanks for the PR, however the ClusterTasks are deprecated and will be removed on the PR #2376

[tekton-robot]

@sveno1990: PR needs rebase.

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