fix(instance): cannot create server with project-id

[ziirish]

While creating a server with a specific project-id, the request fail at the IP creation step.
This is because we provide both a project and an organization while only one of these is expected. We end up with the following error:

  Error while creating your public IP: scaleway-sdk-go: invalid argument(s):  does not respect constraint, Must contain one of ['organization', 'project']

This patch only provides a project since the organization field is deprecated.

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Release note for CHANGELOG:

fix(instance): cannot create server with project-id

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.44%. Comparing base (5bf53e0) to head (34fa022).
Report is 255 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4127      +/-   ##
==========================================
- Coverage   75.45%   72.44%   -3.01%     
==========================================
  Files         202      289      +87     
  Lines       44323    53951    +9628     
==========================================
+ Hits        33444    39086    +5642     
- Misses       9653    13263    +3610     
- Partials     1226     1602     +376     

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