Fix DatadogInterceptor flaky test

[ambushwork]

What does this PR do?

Fix DatadogInterceptor flaky test

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[0xnm]

nice catch! but the same should be applied to the test above as well.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.01%. Comparing base (ce17163) to head (36a3abc).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2274      +/-   ##
===========================================
- Coverage    70.05%   70.01%   -0.04%     
===========================================
  Files          732      732              
  Lines        27209    27198      -11     
  Branches      4579     4578       -1     
===========================================
- Hits         19060    19042      -18     
+ Misses        6876     6873       -3     
- Partials      1273     1283      +10     

see 29 files with indirect coverage changes

[ambushwork]

nice catch! but the same should be applied to the test above as well.

@0xnm if I understand correctly, the test above specifically set the mimeType a stream content type, which will always be parsed as Native type, which will not have a flaky result.