enable cors-everywhere on smeshing-service

[poszu]

Enable the CORS-everywhere policy on the smeshing-service, which is using a proxy to talk with the JSON API on the node side.

[codecov]

Codecov Report

Attention: Patch coverage is 16.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 77.0%. Comparing base (9196145) to head (a294344).
Report is 13 commits behind head on node-split-poc.

Files with missing lines	Patch %	Lines
api/proxy/proxy.go	12.5%	20 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           node-split-poc   #6586     +/-   ##
================================================
+ Coverage            76.8%   77.0%   +0.1%     
================================================
  Files                 346     346             
  Lines               46330   46373     +43     
================================================
+ Hits                35623   35718     +95     
+ Misses               8587    8524     -63     
- Partials             2120    2131     +11     

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[pigmej]

It fixes part of the issue. Now some requests like:
http://localhost:19071/spacemesh.v2alpha1.NetworkService/Info gets duplicated CORS stuff. (applied twice)

That happens when both smesher-service and node-service have json-cors-everywhere specified