fix: eventtype conversion sets all required attributes for new version

[Cali0707]

Fixes a problem where any v1beta2 eventtype converted to a v1beta3 eventtype would have some attributes missing that would make it an invalid v1beta3 eventtype.

Proposed Changes

• Always set all 4 required attributes
• Omit the value for the required attribute if it can't be determined from the v1beta2 resource

[Cali0707]

/cc @matzew @Leo6Leo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.85%. Comparing base (bb2e0a3) to head (8eb8852).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8099      +/-   ##
==========================================
+ Coverage   67.82%   67.85%   +0.02%     
==========================================
  Files         367      367              
  Lines       17411    17427      +16     
==========================================
+ Hits        11809    11825      +16     
  Misses       4864     4864              
  Partials      738      738              

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[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, matzew

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