Remove unicode_escaped_blob feature flag
What does this MR do and why?
Removes the unicode_escaped_blob feature flag as it has been enabled globally for over 1 milestone.
Created by Add unicode_escaped_blob field (!139090 - merged).
Continued use in Add base64_encoded_blob field (!153089 - merged) for further iteration on solution.
Original issue: GraphQL rawTextBlob mangles any blob in an enco... (#388196 - closed).
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Related to #444651 (closed)
Edited by Gavin Hinfey