Lineage constructor to accept clients instead of creating them

[aliok]

Fixes #

Proposed Changes

• Lineage constructor to accept clients instead of creating them
• Motivation
  • Otherwise it is impossible to test the callers of the lineage package
  • Now, I can pass fake clients and essentially mock the lineage package

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

:page_facing_up: "Action required" for the callers of the `knative.dev/eventing/pkg/graph` package. The constructor that has previously accepted a `rest.RestConfig` is now accepting clients (Kubernetes clients) directly instead of creating them in the package.

Docs

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 64.22%. Comparing base (52792ea) to head (3f172cf).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/graph/constructor.go	11.11%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8399      +/-   ##
==========================================
+ Coverage   64.19%   64.22%   +0.02%     
==========================================
  Files         388      388              
  Lines       23310    23302       -8     
==========================================
  Hits        14965    14965              
+ Misses       7550     7542       -8     
  Partials      795      795              

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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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