fix: Added fix for service duplication in openapi2kong cmd.

[shivaygupta-dotcom]

FTI: https://konghq.atlassian.net/browse/FTI-7457

Summary:
We have introduced a new flag --reuse-services for openapi2kong command, to provide service deduplication if needed.

supporting PR: Kong/go-apiops#294

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.62%. Comparing base (dc9d697) to head (877f490).

Files with missing lines	Patch %	Lines
cmd/file_openapi2kong.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2075      +/-   ##
==========================================
- Coverage   32.64%   32.62%   -0.02%     
==========================================
  Files          77       77              
  Lines        7135     7139       +4     
==========================================
  Hits         2329     2329              
- Misses       4610     4614       +4     
  Partials      196      196              

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