Get a callTranscript content is missing $format query parameter

[andrueastman]

Related to https://github.com/microsoftgraph/msgraph-sdk-dotnet/issues/2505

Accroding to docs at https://learn.microsoft.com/en-us/graph/api/calltranscript-get?view=graph-rest-1.0&tabs=csharp#example-2-get-a-calltranscript-content

The path `/users/{id}/onlineMeetings/{meeting-id}/transcripts/{transcript-id}/content?$format=text/vtt supports the $format parameter which is missing in the metadata.