✨ Autoscaling: connect with rabbitmq

[sanderegg]

What do these changes do?

This PR connects the autoscaling app with RabbitMQ.

• added GET /status to recover the current connection status with rabbit MQ (will be enhanced later with EC2, maybe Redis)
• tasks created through the dynamic sidecar also get the labels (user_id, study_id, uuid) NOTE: this will be at some point refactored to better names using inverse urls (see #3638).
• added function to ping rabbitMQ connection
• removed default values in settings RabbitSettings (this could cause some issues in the deployments - to be seen)
• prepare for simplification of tests using rabbitMQ by having a fixture that creates a rabbitmq client
• remove dependency to simcore-postgres-database package from rabbitmq_messages.py
• light refactoring

Bonus:

• add some fixes to improve reliability of test_rabbit.py (webserver integration 02), fixes Flaky tests/integration/02/test_rabbit.py::test_publish_about_users_project #3574
• add some fixes in python-socketio server to correctly cancel its tasks, as discussed here: AsyncServer _service_task was destroyed but it is pending when shutting down server miguelgrinberg/python-socketio#1092
  closing the python-socketio AsyncServer needs some ad-hoc removal.

Related issue/s

needed for #3341

How to test

Checklist

[codecov]

Codecov Report

Merging #3620 (698a0f0) into master (57c8805) will increase coverage by 2.0%.
The diff coverage is 97.8%.

❗ Current head 698a0f0 differs from pull request most recent head f02d3c7. Consider uploading reports for the commit f02d3c7 to get more accurate results

@@           Coverage Diff            @@
##           master   #3620     +/-   ##
========================================
+ Coverage    81.8%   83.9%   +2.0%     
========================================
  Files         868     871      +3     
  Lines       36555   36658    +103     
  Branches      782     782             
========================================
+ Hits        29922   30771    +849     
+ Misses       6426    5680    -746     
  Partials      207     207             

Flag	Coverage Δ
integrationtests	65.6% <100.0%> (-11.3%)	⬇️
unittests	81.4% <97.8%> (+<0.1%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...es/settings-library/src/settings_library/rabbit.py	0.0% <0.0%> (ø)
...rector_v2/modules/comp_scheduler/dask_scheduler.py	89.4% <ø> (+11.5%)	⬆️
...es/dynamic_sidecar/docker_service_specs/sidecar.py	87.5% <ø> (+8.3%)	⬆️
...s/models-library/src/models_library/basic_regex.py	100.0% <100.0%> (ø)
...ckages/models-library/src/models_library/docker.py	100.0% <100.0%> (ø)
...ls-library/src/models_library/rabbitmq_messages.py	97.8% <100.0%> (+0.6%)	⬆️
...ackages/service-library/src/servicelib/rabbitmq.py	94.5% <100.0%> (+0.3%)	⬆️
...ervice_autoscaling/api/dependencies/application.py	100.0% <100.0%> (ø)
...ling/src/simcore_service_autoscaling/api/health.py	100.0% <100.0%> (ø)
...ling/src/simcore_service_autoscaling/api/routes.py	100.0% <100.0%> (ø)
... and 61 more

[pcrespov]

Nice!

[GitHK]

Very nice: one question below about rabbit being not properly configured. I'm wondering what happens if there was a mistake in the DNS, when and where would that be seen

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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