fix(process_segments): Handle non-numeric measurement values

[seer-by-sentry]

Fixes SENTRY-44CH. The issue was that: Network throughput measurement, originating from a browser SDK, is an empty dictionary, causing convert_span_to_item to fail when accessing its expected 'value' key.

• Ensures measurement values are dictionaries before accessing the 'value' key.
• Checks if the 'value' key exists in the measurement dictionary.
• Attempts to convert the measurement value to a float, skipping if conversion fails.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 208228

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[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...sentry/spans/consumers/process_segments/convert.py	71.42%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #94766    +/-   ##
========================================
  Coverage   87.91%   87.92%            
========================================
  Files       10430    10434     +4     
  Lines      603230   603472   +242     
  Branches    23466    23466            
========================================
+ Hits       530353   530575   +222     
- Misses      72371    72391    +20     
  Partials      506      506            

[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀