Allow references to ClusterTasks in v1 Pipeline Tasks

[lbernick]

We cannot yet remove support for ClusterTasks, so they should continue to be referenceable from v1 Pipelines. This commit removes an error message associated with referencing ClusterTasks in v1 Pipelines.

Closes #6587

/kind bug

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Release Notes

Continue to allow v1beta1 ClusterTasks (deprecated) to be referenced in v1 Pipelines

[Yongxuanzhang]

Thanks for fixing this!

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[Yongxuanzhang]

/lgtm

[vdemeester]

This needs to be backported in a few releases then (the LTS), at least 0.44.x and 0.47.x I think.
/cc @lbernick @jerop @afrittoli

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In response to this:

This needs to be backported in a few releases then (the LTS), at least 0.44.x and 0.47.x I think.
/cc @lbernick @jerop @afrittoli

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[lbernick]

I don't think this needs to be backported since #6505 is not part of a release

[vdemeester]

Ah I thought it predated #6505, 👌🏼