Use links to artifact on uninstall page

[prushh]

Fixes #5835

Proposed Changes

• Use artifact function to retrieve release links on Uninstalling Knative page, for the following files:
  • serving-core.yaml
  • serving-crds.yaml
  • eventing-core.yaml
  • eventing-crds.yaml

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[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: prushh, ReToCode

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[ReToCode]

/cherry-pick release-1.13

[knative-prow-robot]

@ReToCode: once the present PR merges, I will cherry-pick it on top of release-1.13 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.13

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[knative-prow-robot]

@ReToCode: new pull request created: #5838

In response to this:

/cherry-pick release-1.13

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.