Rename apiextentions to apiextensions

[aliok]

Fixes #

Proposed Changes

• Took me quite some time to understand why Kube API server was returning 404s when I wanted the event lineage to fetch sources

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

Docs

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.10%. Comparing base (1b3287e) to head (ad3174a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/graph/constructor.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8428   +/-   ##
=======================================
  Coverage   64.10%   64.10%           
=======================================
  Files         388      388           
  Lines       23363    23363           
=======================================
  Hits        14976    14976           
  Misses       7591     7591           
  Partials      796      796           

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[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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