Add IMC webhook the permission to update namespaces/finalizers

[aliok]

Fixes #

Issues in e2e tests like https://github.com/knative/eventing/runs/2829340913#step:12:5268

Proposed Changes

Same as #5501 but for IMC, which now is a separate component with its own webhook and stuff.

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

imc-controller cluster role now has update permission for namespaces/finalizers.

Docs

[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aliok, matzew

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Details

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• OWNERS [aliok,matzew]

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[aliok]

/retest

Infra

There are no nodes that your pod can schedule to - check your requests, tolerations, and node selectors (skip schedule deleting pod: test-pods/ef3e8b62-d338-11eb-b01a-da3ff9498687)

[codecov]

Codecov Report

Merging #5539 (159a10e) into main (b312f0e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5539   +/-   ##
=======================================
  Coverage   82.56%   82.56%           
=======================================
  Files         198      198           
  Lines        6125     6125           
=======================================
  Hits         5057     5057           
  Misses        741      741           
  Partials      327      327           

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