wf Worker should only close clients it has initialized

[tscolari]

Description

This avoids the workflow worker from closing externally provided dapr clients.
It should only close clients it created itself, not external ones - which would have unexpected side effects cross the caller's code.

Issue reference

#747

Please reference the issue this PR will close: #747

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

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 57.14%. Comparing base (6c59092) to head (a449de1).
Report is 28 commits behind head on main.

Files with missing lines	Patch %	Lines
workflow/worker.go	54.54%	2 Missing and 3 partials ⚠️

❗ There is a different number of reports uploaded between BASE (6c59092) and HEAD (a449de1). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (6c59092)	HEAD (a449de1)
	4	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #748      +/-   ##
==========================================
- Coverage   62.52%   57.14%   -5.39%     
==========================================
  Files          56       58       +2     
  Lines        4139     4429     +290     
==========================================
- Hits         2588     2531      -57     
- Misses       1425     1761     +336     
- Partials      126      137      +11     

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[mikeee]

lgtm