style: rm warning for python 3.14

[sicoyle]

Description

This change will rm a warning we would get on python 3.14. Stylistic change for better UX.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[Copilot]

Pull request overview

Removes a Python 3.14+ SyntaxWarning triggered by a return inside a finally block in the workflow durable task gRPC client context manager, improving user experience while keeping the same exception-suppression behavior for workflow execution.

Changes:

• Refactors TaskHubGrpcClient.__exit__ to avoid return in finally (Python 3.14+ warning).
• Adds explanatory comments describing why returning False is preserved and why close() is safe to call directly.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.73%. Comparing base (bffb749) to head (effb63e).
⚠️ Report is 137 commits behind head on main.

Files with missing lines	Patch %	Lines
...-workflow/dapr/ext/workflow/_durabletask/client.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1072      +/-   ##
==========================================
- Coverage   86.63%   82.73%   -3.90%     
==========================================
  Files          84      146      +62     
  Lines        4473    14692   +10219     
==========================================
+ Hits         3875    12155    +8280     
- Misses        598     2537    +1939     

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