Make WebhookMessageEventGrid compatible with the event grid format

[chkeita]

Summary of the Pull Request

Updated WebhookMessageEventGrid Updated the dataVersion field to 2.0

closes #3285

[codecov-commenter]

Codecov Report

Merging #3286 (cdaaabc) into main (d5b2a33) will decrease coverage by 0.02%. The diff coverage is 25.00%.

@@            Coverage Diff             @@
##             main    #3286      +/-   ##
==========================================
- Coverage   29.66%   29.65%   -0.02%     
==========================================
  Files         333      333              
  Lines       39377    39377              
==========================================
- Hits        11680    11676       -4     
- Misses      27697    27701       +4     

Impacted Files	Coverage Δ
src/ApiService/Tests/OrmModelsTest.cs	0.00% <0.00%> (ø)
...Service/ApiService/onefuzzlib/WebhookOperations.cs	35.71% <66.66%> (ø)
src/ApiService/ApiService/OneFuzzTypes/Webhooks.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes