feat: add triggers to event lineage graph

[Cali0707]

Fixes #7679

Proposed Changes

• Add a function that maps a trigger to a edge (or edges) as outlined in Event Lineage: Map Triggers to Graph Edges #7679
• Add unit tests

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707

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[Cali0707]

/cc @Leo6Leo @matzew @creydr

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 69.19%. Comparing base (6f944bf) to head (0d16384).
Report is 9 commits behind head on main.

Files	Patch %	Lines
pkg/graph/constructor.go	85.71%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7746      +/-   ##
==========================================
+ Coverage   69.15%   69.19%   +0.03%     
==========================================
  Files         339      339              
  Lines       19429    19471      +42     
==========================================
+ Hits        13437    13473      +36     
- Misses       5330     5335       +5     
- Partials      662      663       +1     

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[Leo6Leo]

I left few comments and questions, otherwise it looks good!

[Leo6Leo]

Adding comments saying this is the Uri to the DLS would be helpful

[Leo6Leo]

/lgtm