fix(testing/unstable): use the correct function frame in inline snapshot

[mochaaP]

Before the fix, it will always write to unstable_snapshot.ts:createAssertInlineSnapshot.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.61%. Comparing base (95a1e2e) to head (4f952ad).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7150   +/-   ##
=======================================
  Coverage   94.61%   94.61%           
=======================================
  Files         634      634           
  Lines       51843    51846    +3     
  Branches     9346     9347    +1     
=======================================
+ Hits        49050    49053    +3     
  Misses       2218     2218           
  Partials      575      575           

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