Remove sugar controller installation and uninstallation steps

[prushh]

Fixes #5826

Proposed Changes

• Remove the separate sugar controller installation/uninstallation steps from
  • Installing Knative Eventing using YAML files / Uninstalling Knative
• Remove the eventing-sugar-controller.yaml file from table
  • Knative Eventing installation files

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[ReToCode]

/assign @pierDipi

[matzew]

/lgtm
/approve

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, pierDipi, prushh

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[matzew]

/cherry-pick release-1.13

[knative-prow-robot]

@matzew: new pull request created: #5843

In response to this:

/cherry-pick release-1.13

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[matzew]

Thanks for the PR, @prushh