Fix filename -> fileName in diagnostic data keys

[Enkidu93]

Fixes a misspelling which is causing a failing E2E test.

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This change is 

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.44%. Comparing base (d70f397) to head (d871f88).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1024      +/-   ##
==========================================
- Coverage   72.53%   72.44%   -0.10%     
==========================================
  Files         391      391              
  Lines       21627    21627              
  Branches     2815     2815              
==========================================
- Hits        15688    15668      -20     
- Misses       4813     4834      +21     
+ Partials     1126     1125       -1     

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[pmachapman]

@pmachapman reviewed 2 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Enkidu93).

[ddaspit]

@ddaspit reviewed 2 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Enkidu93).