docs(examples): remove deleted v1beta1 references

[nthbotast]

Summary

• updates commands to use existing paths
• removes stale references to deleted paths

Fixes #9499

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[tekton-robot]

@nthbotast: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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