fix(instance): explicitly set IP type based on routed-ip-enabled value

[ziirish]

The default values for 'server.routed-ip-enabled' and 'ip.type' will change in a near future.
This fix ensures we always set the ip.type accordingly with the context.

Without this change, users will end up with the following error:

❯ scw instance server create routed-ip-enabled=false
Cannot create the server: scaleway-sdk-go: http error 400 Bad Request: cannot attach ip of type 'routed'

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Relates OR Closes #0000

Release note for CHANGELOG:

- fix: explicitly set IP type based on routed-ip-enabled value

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (fd9f90a) 75.87% compared to head (83ffbda) 75.87%.

Files	Patch %	Lines
...nal/namespaces/instance/v1/custom_server_create.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3668   +/-   ##
=======================================
  Coverage   75.87%   75.87%           
=======================================
  Files         189      189           
  Lines       42597    42599    +2     
=======================================
+ Hits        32319    32321    +2     
+ Misses       9091     9090    -1     
- Partials     1187     1188    +1     

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