render package-level info from channel head in semver template

[grokspawn]

Description of the change:
when expanding semver catalog templates, pulls the package info for generated FBC from the default channel head bundle, solving #1837

Motivation for the change:

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

[openshift-ci]

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[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.68%. Comparing base (9d741cf) to head (ea21fb2).
⚠️ Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
alpha/template/semver/semver.go	84.61%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1933      +/-   ##
==========================================
+ Coverage   57.52%   57.68%   +0.15%     
==========================================
  Files         139      139              
  Lines       13339    13365      +26     
==========================================
+ Hits         7673     7709      +36     
+ Misses       4484     4469      -15     
- Partials     1182     1187       +5     

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