Fix missing HttpContext on ValidationContext during atomic operations

[Tommy228]

Closes #1250

This PR

• Adds HttpContext to the ValidationContext when validating objects during atomic operations, allowing dependency injection
• Adds a test case to the integration tests to validate this

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A Documentation updated

[codecov]

Codecov Report

Merging #1251 (1e343e7) into master (c7e396d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 1e343e7 differs from pull request most recent head ffa5015. Consider uploading reports for the commit ffa5015 to get more accurate results

@@           Coverage Diff           @@
##           master    #1251   +/-   ##
=======================================
  Coverage   92.62%   92.62%           
=======================================
  Files         243      243           
  Lines        7795     7796    +1     
=======================================
+ Hits         7220     7221    +1     
  Misses        575      575           

Impacted Files	Coverage Δ
...ore/Controllers/BaseJsonApiOperationsController.cs	100.00% <100.00%> (ø)

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[bkoelman]

Hi @Tommy228, thanks for your contribution! I intend to look at it somewhere this week.

[bkoelman]

Thanks for carefully adhering to our code style and naming conventions. See comments below.