restricting icon size to 100kb.

[ksykulev]

fixes #32826

Testing

• Added/updated automated tests
• QA'd all new/changed functionality manually

For unreleased bug fixes in a release candidate, one of:

• Confirmed that the fix is not expected to adversely impact load test results
• Alerted the release DRI if additional load testing is needed

[ksykulev]

[codecov]

Codecov Report

❌ Patch coverage is 54.16667% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.80%. Comparing base (db0b92f) to head (eca34e0).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
server/service/software_title_icons.go	59.09%	6 Missing and 3 partials ⚠️
...reTitleDetailsPage/EditIconModal/EditIconModal.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #32834      +/-   ##
==========================================
- Coverage   63.81%   63.80%   -0.01%     
==========================================
  Files        2040     2040              
  Lines      201163   201181      +18     
  Branches     6644     6681      +37     
==========================================
+ Hits       128363   128371       +8     
- Misses      62650    62656       +6     
- Partials    10150    10154       +4     

Flag	Coverage Δ
backend	64.99% <59.09%> (-0.01%)	⬇️
frontend	52.47% <0.00%> (-0.01%)	⬇️

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[iansltx]

Good enough to merge.