HoldTillRename: Rename knative-sandbox to knative-extensions

[davidhadas]

This is an auotmated PR to replace strings to . Do not merge until Rename knative-sandbox org is renamed to knative-extensions

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: davidhadas
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[knative-prow]

@davidhadas: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-knative-sandbox-peribolos	d811c7a	link	true	/test pull-knative-sandbox-peribolos

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[davidhadas]

replaced with knative-extension