fix: metadata validation is missing hidi installation

Signed-off-by: Vincent Biret <[email protected]>

Author: baywet

.azure-pipelines/generation-templates/capture-metadata.yml

@@ -115,6 +115,14 @@ steps:
 
 - template: use-dotnet-sdk.yml
 
+# required for the hidi installation validation
+- template: use-dotnet-sdk.yml
+  parameters:
+    version: '9.x'
+
+- pwsh: dotnet tool install -g Microsoft.OpenApi.Hidi
+  displayName: 'Install hidi tool'
+
 # verify that generated metadata is parsable as an Edm model
 - pwsh: $(Build.SourcesDirectory)/msgraph-metadata/scripts/run-metadata-validation.ps1 -repoDirectory "$(Build.SourcesDirectory)/msgraph-metadata/" -version "${{ parameters.endpoint }}"
   displayName: 'verify whether metadata is parsable as an Edm model'