✨ Autoscaling: have only one ec2 client

[sanderegg]

What do these changes do?

This PR refactors the Autoscaling service such that only 1 EC2 client is used in the application.

Also refactors modules to follow other fastapi-based services architecture

Related issue/s

relates to #3600

How to test

Checklist

[codecov]

Codecov Report

Merging #3643 (8533555) into master (43192a2) will decrease coverage by 20.7%.
The diff coverage is 100.0%.

@@            Coverage Diff            @@
##           master   #3643      +/-   ##
=========================================
- Coverage    84.2%   63.4%   -20.8%     
=========================================
  Files         876     373     -503     
  Lines       37053   18678   -18375     
  Branches      784     135     -649     
=========================================
- Hits        31224   11859   -19365     
- Misses       5622    6770    +1148     
+ Partials      207      49     -158     

Flag	Coverage Δ
integrationtests	62.4% <ø> (-5.1%)	⬇️
unittests	98.8% <100.0%> (+17.3%)	⬆️

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

Impacted Files	Coverage Δ
...ling/src/simcore_service_autoscaling/api/health.py	100.0% <100.0%> (ø)
...rc/simcore_service_autoscaling/core/application.py	100.0% <100.0%> (ø)
...ing/src/simcore_service_autoscaling/core/errors.py	100.0% <100.0%> (ø)
...imcore_service_autoscaling/dynamic_scaling_core.py	100.0% <100.0%> (ø)
...ing/src/simcore_service_autoscaling/modules/ec2.py	100.0% <100.0%> (ø)
...rc/simcore_service_autoscaling/modules/rabbitmq.py	100.0% <100.0%> (ø)
...aling/src/simcore_service_autoscaling/utils/ec2.py	100.0% <100.0%> (ø)
.../src/simcore_service_autoscaling/utils/rabbitmq.py	100.0% <100.0%> (ø)
...-v2/src/simcore_service_director_v2/cli/_client.py	0.0% <0.0%> (-100.0%)	⬇️
...v2/src/simcore_service_director_v2/cli/__init__.py	0.0% <0.0%> (-100.0%)	⬇️
... and 704 more

[pcrespov]

Excellent! Some minor inputs below

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication