Updated preview contract for extensibility v2.

[kalbert312]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 39.28571% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.49%. Comparing base (c9779e0) to head (3b31b89).

Files with missing lines	Patch %	Lines
...y.Core/Json/OrdinalIgnoreCaseStringSetConverter.cs	57.89%	4 Missing and 4 partials ⚠️
...s.Extensibility.Core/V2/Models/ResourceMetadata.cs	0.00%	5 Missing ⚠️
...ensibility.Core/V2/Models/ResourceSpecification.cs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #328      +/-   ##
==========================================
+ Coverage   39.43%   39.49%   +0.06%     
==========================================
  Files          74       76       +2     
  Lines        1207     1233      +26     
  Branches      124      130       +6     
==========================================
+ Hits          476      487      +11     
- Misses        724      735      +11     
- Partials        7       11       +4     

Files with missing lines	Coverage Δ
...ensibility.Core/V2/Models/ResourceSpecification.cs	0.00% <0.00%> (ø)
...s.Extensibility.Core/V2/Models/ResourceMetadata.cs	0.00% <0.00%> (ø)
...y.Core/Json/OrdinalIgnoreCaseStringSetConverter.cs	57.89% <57.89%> (ø)

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