Fix director service discovery

[GitHK]

What do these changes do?

Fixes an issue where the director was not completely filtering the services by the swarm_stack_name label

Related issue number

How to test

Checklist

• Did you change any service's API? Then make sure to bundle document and upgrade version (make openapi-specs, git commit ... and then make version-*)
• Unit tests for the changes exist
• Runs in the swarm
• Documentation reflects the changes
• New module? Add your github username to .github/CODEOWNERS

[codecov]

Codecov Report

Merging #1538 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1538   +/-   ##
=======================================
  Coverage   71.33%   71.33%           
=======================================
  Files         249      249           
  Lines       10015    10015           
  Branches     1106     1106           
=======================================
  Hits         7144     7144           
  Misses       2553     2553           
  Partials      318      318           

Flag	Coverage Δ
#integrationtests	57.71% <ø> (ø)
#unittests	63.29% <100.00%> (ø)

Impacted Files	Coverage Δ
.../director/src/simcore_service_director/producer.py	65.32% <100.00%> (ø)

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[sanderegg]

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