Stop stream if there are no payments from Gateway

[leszko]

Stop stream on the Orchestrator side if there are not enough payments from Gateway.

We fixed a couple of bugs and the "insufficient balance" does not happen anymore, so we should should tear down the stream if the payments are not coming from Gateway.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 31.76625%. Comparing base (798060e) to head (f433753). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
server/ai_http.go	0.00000%	6 Missing :warning:

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3623         +/-   ##
===================================================
+ Coverage   31.75089%   31.76625%   +0.01536%     
===================================================
  Files            156         156                 
  Lines          47353       47349          -4     
===================================================
+ Hits           15035       15041          +6     
+ Misses         31436       31427          -9     
+ Partials         882         881          -1     

Files with missing lines	Coverage Δ
server/ai_http.go	9.66767% <0.00000%> (+0.05806%)	:arrow_up:

... and 2 files with indirect coverage changes

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Files with missing lines	Coverage Δ
server/ai_http.go	9.66767% <0.00000%> (+0.05806%)	:arrow_up:

... and 2 files with indirect coverage changes

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[leszko]

I'll wait 1 week before merging this PR, because I noticed a few single cases with "insufficient balance". It was for high-resolution and the balance was at the borderline, so I'll increase slightly the init payment (the buffer) and wait 1 week to see if it still occurs.