Iframe lazy loading

[odeimaiz]

What do these changes do?

This PR makes the frontend nodes connect to their dynamic service's iframes on demand.

When opening studies with many dynamic services, all the iframes were connected and opened right away, creating hundreds of parallel requests, overloading the backend and the frontend. With these changes, dynamic services will be started, the /retrieve endpoint called, BUT the iframe will not be loaded until the user opens it.

Before:

After:

Related issue/s

related to #2785

How to test

Checklist

[codecov]

Codecov Report

Merging #2790 (fb5929b) into master (4fe88ae) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #2790     +/-   ##
========================================
- Coverage    78.9%   78.8%   -0.1%     
========================================
  Files         670     670             
  Lines       27186   27186             
  Branches     2669    2669             
========================================
- Hits        21459   21448     -11     
- Misses       4971    4981     +10     
- Partials      756     757      +1     

Flag	Coverage Δ
integrationtests	65.9% <ø> (+<0.1%)	⬆️
unittests	74.4% <ø> (-0.1%)	⬇️

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

Impacted Files	Coverage Δ
...c/simcore_service_catalog/core/background_tasks.py	68.0% <0.0%> (-13.9%)	⬇️
...imcore_service_catalog/db/repositories/projects.py	41.6% <0.0%> (-12.5%)	⬇️
...simcore_service_webserver/projects/project_lock.py	94.7% <0.0%> (-5.3%)	⬇️
...ore_service_director_v2/api/routes/computations.py	78.6% <0.0%> (-1.8%)	⬇️
...car/src/simcore_service_dask_sidecar/dask_utils.py	90.7% <0.0%> (-1.1%)	⬇️
.../director/src/simcore_service_director/producer.py	61.7% <0.0%> (+0.2%)	⬆️
...ervices/storage/src/simcore_service_storage/dsm.py	74.0% <0.0%> (+0.6%)	⬆️
...ce_webserver/resource_manager/garbage_collector.py	73.5% <0.0%> (+0.8%)	⬆️
...ce_webserver/resource_manager/websocket_manager.py	97.3% <0.0%> (+4.0%)	⬆️

[sanderegg]

beyond greatness

[KZzizzle]

super cool, thanks for the notice!