Validate use of parameters in naked functions
* Reject use of parameters inside naked function body.
* Reject use of patterns inside function parameters, to emphasize role
of parameters a signature declaration (mirroring existing behaviour
for function declarations) and avoid generating code introducing
specified bindings.
Closes issues below by considering input to be ill-formed.
Closes#75922.
Closes#77848.
Closes#79350.
b48cafd9eb