[frontend] Add tests for ExportButton component (fronted tests) (#2285)

[antoinemzs]

Proposed changes

• Adding tests for the ExportButton component

Related issues

• Contributes to [ Unit testing - simulation scope ] - import/export of a simulation (XLS) #2285

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.70%. Comparing base (b0a8d1f) to head (d968fc7).
⚠️ Report is 526 commits behind head on release/current.

Additional details and impacted files

@@                Coverage Diff                 @@
##             release/current    #2218   +/-   ##
==================================================
  Coverage              43.70%   43.70%           
  Complexity              2608     2608           
==================================================
  Files                    717      717           
  Lines                  22272    22272           
  Branches                1536     1536           
==================================================
  Hits                    9734     9734           
  Misses                 12007    12007           
  Partials                 531      531           

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