Revert Zone.current.print logger workaround

[Rexios80]

Summary

• Reverts the Zone.current.print logger workaround added for flaky isolate tests
• dart-lang/sdk#63408 is fixed, so top-level print() again honors ZoneSpecification.print after isolate thread migration

Test plan

• CI passes, especially isolate_test.dart / hive VM tests that capture logger output via runZoned

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.59%. Comparing base (66e6c80) to head (e07065a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #309      +/-   ##
==========================================
- Coverage   93.63%   93.59%   -0.05%     
==========================================
  Files          64       64              
  Lines        2623     2622       -1     
==========================================
- Hits         2456     2454       -2     
- Misses        167      168       +1     

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