fix(amazonq): fix the issue that invalid image notification always show

[yzhangok]

Problem

Invalid Image notification shown even all dropped images are valid.

Solution

Add conditional check to only show the notification when there are more than one errors

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.16%. Comparing base (68adf18) to head (b3fcac6).

Files with missing lines	Patch %	Lines
chat-client/src/client/mynahUi.ts	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2007      +/-   ##
==========================================
+ Coverage   61.15%   61.16%   +0.01%     
==========================================
  Files         239      239              
  Lines       52115    52117       +2     
  Branches     3127     3130       +3     
==========================================
+ Hits        31869    31879      +10     
+ Misses      20187    20179       -8     
  Partials       59       59              

Flag	Coverage Δ
unittests	61.16% <0.00%> (+0.01%)	⬆️

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