UNST-9564: connect bubble screen to ec module

[mihai-pricope]

What was done

alloc all sourcesink objects before so that ecModule pointers remain valid
connect only the first bubble screen source sink to ecModule to write the air discharge in qstss

Evidence of the work done

• Video/figures

 Bubblescreen bubbles1 total discharge at time    900.000000000000       is 
   204.166666665697     
 Bubblescreen bubbles1 total discharge at time    1200.00000000000       is 
   205.555555556202     
 Bubblescreen bubbles1 total discharge at time    1500.00000000000       is 
   206.944444443798     
 Bubblescreen bubbles1 total discharge at time    1800.00000000000       is 
   208.333333334303    

• Clear from the issue description
• Not applicable

Tests

• Tests updated
  <add testcase numbers if applicable, Issue number>
• [X ] Not applicable

Documentation

• Documentation updated
  <add description of changes if applicable, Issue number>
• [ X] Not applicable

Issue link

https://issuetracker.deltares.nl/browse/UNST-9564

[thomas-pijls]

Looks good to me!