Update WebJobs blob extension to remove collection parameter binding data

[liliankasem]

Update the WebJobs blob extension to remove ParameterBinding from the MultiBlobContext use case

[liliankasem]

PR was opened for this here. As this is a breaking change for the WebJobs extension, we have decided not to push these cleanup changes through and avoid potential delay to our GA deadline for Blobs and Queue SDK binding support.