fix: Create mutation introspection

[nasdf]

Relevant issue(s)

Resolves #2868

Description

This PR fixes the create mutation return type.

Tasks

• I made sure the code is well commented, particularly hard-to-understand areas.
• I made sure the repository-held documentation is changed accordingly.
• I made sure the pull request title adheres to the conventional commit style (the subset used in the project can be found in tools/configs/chglog/config.yml).
• I made sure to discuss its limitations such as threats to validity, vulnerability to mistake and misuse, robustness to invalidation of assumptions, resource requirements, ...

How has this been tested?

manually tested in playground

Specify the platform(s) on which this was tested:

• MacOS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.43%. Comparing base (8bd255f) to head (0f30014).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2881      +/-   ##
===========================================
- Coverage    79.52%   79.43%   -0.10%     
===========================================
  Files          325      325              
  Lines        24778    24778              
===========================================
- Hits         19704    19680      -24     
- Misses        3668     3682      +14     
- Partials      1406     1416      +10     

Flag	Coverage Δ
all-tests	79.43% <100.00%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
internal/request/graphql/schema/generate.go	87.95% <100.00%> (ø)

... and 14 files with indirect coverage changes

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[AndrewSisley]

Nice spot, thanks Keenan