Fix resource metal connection

[ocobles]

• Always return project_id specified in the schema (to cover dedicated connection without project), and later for shared connections check project assigned to the virtual circuit.
• Allow retrieve existing connections created through the portal with speed value 0.
• Sort ports by role , asserting the API always returns primary for len of 1 responses (to replicate current provider equinix behavoir).

fix #222

[codecov-commenter]

Codecov Report

Merging #223 (173aab5) into main (2e9d3a0) will decrease coverage by 8.43%. The diff coverage is 52.11%.

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
- Coverage   76.64%   68.21%   -8.44%     
==========================================
  Files          48       48              
  Lines        6307     6330      +23     
==========================================
- Hits         4834     4318     -516     
- Misses       1239     1836     +597     
+ Partials      234      176      -58     

Impacted Files	Coverage Δ
metal/resource_metal_connection.go	71.46% <46.87%> (-1.10%)	:arrow_down:
metal/datasource_metal_connection.go	98.66% <100.00%> (+0.02%)	:arrow_up:
metal/mutexkv.go	19.04% <0.00%> (-80.96%)	:arrow_down:
metal/datasource_metal_ip_block_ranges.go	40.86% <0.00%> (-41.74%)	:arrow_down:
metal/resource_metal_port_vlan_attachment.go	24.00% <0.00%> (-41.34%)	:arrow_down:
metal/resource_metal_bgp_session.go	46.91% <0.00%> (-38.28%)	:arrow_down:
metal/resource_metal_device_network_type.go	26.31% <0.00%> (-35.79%)	:arrow_down:
metal/datasource_metal_device_bgp_neighbors.go	71.09% <0.00%> (-26.57%)	:arrow_down:
metal/datasource_metal_device.go	63.91% <0.00%> (-25.09%)	:arrow_down:
metal/datasource_metal_spot_market_request.go	61.85% <0.00%> (-23.72%)	:arrow_down:
... and 10 more

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