fix(i): Default field value overwrite on update

[nasdf]

Relevant issue(s)

Resolves #3029

Description

This PR fixes an issue where default field values would overwrite any missing input fields.

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?

Added integration test

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 79.32%. Comparing base (5754d7d) to head (59f15d1).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3030      +/-   ##
===========================================
- Coverage    79.34%   79.32%   -0.02%     
===========================================
  Files          333      333              
  Lines        25841    25840       -1     
===========================================
- Hits         20502    20495       -7     
- Misses        3870     3876       +6     
  Partials      1469     1469              

Flag	Coverage Δ
all-tests	79.32% <100.00%> (-0.02%)	⬇️

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

Files with missing lines	Coverage Δ
internal/request/graphql/schema/generate.go	87.95% <100.00%> (-0.02%)	⬇️

... and 18 files with indirect coverage changes

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[fredcarle]

LGTM. Nice find!

[shahzadlone]

Good catch!