handle cases where spec.version.release is a number instead of string

[grokspawn]

Assisted-By: claude

Description of the change:
explicitly handles the case where a CSV's spec.release version is represented as an int or float instead of a string.

Motivation for the change:
while the tooling in operator-framework should always steer towards CSVs which use string release values, there remain a variety of ways to generate a CSV which might result in a numerical value for release. So we need to provide a more flexible import approach to encompass these capabilities.

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.48%. Comparing base (a40ca89) to head (10fed99).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1909      +/-   ##
==========================================
+ Coverage   57.44%   57.48%   +0.03%     
==========================================
  Files         139      139              
  Lines       13323    13328       +5     
==========================================
+ Hits         7653     7661       +8     
+ Misses       4488     4485       -3     
  Partials     1182     1182              

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