editoast: use pooling for amqp

[ElysaSrc]

Closes #9318

[flomonster]

LGTM (not tested)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 39.16%. Comparing base (665e2b6) to head (57d7303).
Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/src/core/mq_client.rs	0.00%	30 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9317      +/-   ##
============================================
- Coverage     39.17%   39.16%   -0.02%     
  Complexity     2245     2245              
============================================
  Files          1290     1290              
  Lines         97241    97265      +24     
  Branches       3280     3280              
============================================
- Hits          38093    38090       -3     
- Misses        57209    57236      +27     
  Partials       1939     1939              

Flag	Coverage Δ
core	74.94% <ø> (ø)
editoast	72.46% <0.00%> (+0.03%)	⬆️
front	10.33% <ø> (-0.01%)	⬇️
gateway	2.50% <ø> (ø)
osrdyne	3.52% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.71% <ø> (ø)

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[bloussou]

🙏

[clarani]

LGTM ✅

[bougue-pe]

Feel free to resolve without addressing if in rush 🙏

[Khoyo]

I don't believe this address the root issue (ie. probably channel leaks), but it might hide it enough for now

[ElysaSrc]

I don't believe this address the root issue (ie. probably channel leaks), but it might hide it enough for now

Added explicit closing of the channels.