RPC spec generator no longer generates unused SDLRPCParameterNames

[NicoleYarroch]

Fixes #1905

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).

Unit Tests

RPC Spec generator tests were updated and run.

Core Tests

The library was not modified. Only the RPC Spec generator was modified.

Core version / branch / commit hash / module tested against: N/A
HMI name / version / branch / commit hash / module tested against: N/A

Summary

Fixed the RPC Spec generator so it no longer generates a SDLRPCParameterName enum for a struct name.

Changelog

Bug Fixes

• RPC spec generator no longer generates unused SDLRPCParameterNames

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #1917 (9a93e69) into develop (0f8d099) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1917   +/-   ##
========================================
  Coverage    84.93%   84.93%           
========================================
  Files          426      426           
  Lines        21383    21383           
========================================
+ Hits         18161    18162    +1     
+ Misses        3222     3221    -1