fix: fixing fabric connection schema for port 2 network connection

[srushti-patl]

This fix Includes:

• Added EVPLAN_VC,EPLAN_VC to fabric connection schema
• Marked project_id as an optional parameter

[codecov-commenter]

Codecov Report

Attention: 381 lines in your changes are missing coverage. Please review.

Comparison is base (26b2f3d) 60.11% compared to head (5dd9d8e) 59.71%.
Report is 85 commits behind head on main.

Files	Patch %	Lines
equinix/fabric_mapping_helper.go	0.00%	68 Missing ⚠️
equinix/resource_fabric_connection.go	0.00%	40 Missing ⚠️
equinix/resource_fabric_cloud_router.go	0.00%	32 Missing ⚠️
equinix/resource_fabric_service_profile.go	0.00%	14 Missing ⚠️
equinix/resource_fabric_routing_protocol.go	0.00%	13 Missing ⚠️
equinix/resource_metal_device.go	76.36%	10 Missing and 3 partials ⚠️
equinix/resource_metal_organization_member.go	27.77%	13 Missing ⚠️
equinix/resource_metal_project.go	52.63%	8 Missing and 1 partial ⚠️
equinix/resource_metal_vlan.go	43.75%	8 Missing and 1 partial ⚠️
equinix/resource_ecx_l2_connection.go	38.46%	8 Missing ⚠️
... and 39 more

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #478      +/-   ##
==========================================
- Coverage   60.11%   59.71%   -0.41%     
==========================================
  Files          99       97       -2     
  Lines       20045    19825     -220     
==========================================
- Hits        12051    11839     -212     
- Misses       7691     7695       +4     
+ Partials      303      291      -12     

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[thogarty]

LGTM. Ship it.