chore(toolkit-lib): consider developer builds as supporting context overflow

[mrgrain]

Updates the context overflow support detection logic to consider developer builds (with version 0.0.0) as supported. This has no customer facing impact but prevents an incorrect debug message from being emitted when using a dev build of the framework, e.g. when running integ tests in the aws/aws-cdk repo.

Also extracts the context overflow detection logic into a separate function to improve testability and maintainability. Added unit tests to ensure the function works correctly with different CDK versions.

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.06%. Comparing base (51a1406) to head (560558d).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #721      +/-   ##
==========================================
+ Coverage   79.41%   80.06%   +0.65%     
==========================================
  Files          50       50              
  Lines        7295     7295              
  Branches      825      831       +6     
==========================================
+ Hits         5793     5841      +48     
+ Misses       1483     1432      -51     
- Partials       19       22       +3     

Flag	Coverage Δ
suite.unit	80.06% <ø> (+0.65%)	⬆️

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