Add DataObject tests

[harshit7962]

Description

The changes here aims at adding tests around ContainsText, ContainsAudio, and ContainsImage method of DataObject class. This is to validate that the contracts are not breached and avoid minor bugs after the merger of #10544. The changes also references to a task item mentioned in #10736.
Have moved the previous tests a bit to make sure they are in the desired region and hence the removals may look unnecessary, but these tests are still present in the same file.

Regression

None

Testing

Build pass, the tests are all green

Risk

Low

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.71918%. Comparing base (97aabac) to head (3f9aa97).
Report is 4 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #10781         +/-   ##
===================================================
+ Coverage   13.06870%   13.71918%   +0.65048%     
===================================================
  Files           3316        3317          +1     
  Lines         665468      665630        +162     
  Branches       74669       74674          +5     
===================================================
+ Hits           86968       91319       +4351     
+ Misses        576158      571617       -4541     
- Partials        2342        2694        +352     

Flag	Coverage Δ
Debug	13.71918% <100.00000%> (+0.65047%)	⬆️

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