fix: Add body to 403 Operations in FDR

[RohinBhargava]

Short description of the changes made

• Adds type of string to the two 403 Error codes.

What was the motivation & context behind this PR?

• When there is no body provided for 403, the client fetcher cannot properly parse the "Forbidden" content. The reason this is, when only sending sendStatus, no content-type is set. An alternate change could be that if no type is detected for an error, we add a text content-type header when generating the typescript server stub.

How has this PR been tested?

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[RohinBhargava]

The right thing to do is to add the text content-type when generating; making a follow up ticket