Remove unused samples.thread column

[mstange]

Main | Deploy preview

This was added by the merging/diffing code and propagated in various places, but never actually read. There is a possibility that we may want to make use of this field in the future, but it's been many years and it hasn't happened, so let's just remove it for now. We can always add it back once we need it.

I noticed it because it ends up in the "compact" speedometer profiles from CI via profiler-edit --merge-non-overlapping-threads-by-name.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.50%. Comparing base (b2c0eba) to head (7bc758e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #6151    +/-   ##
========================================
  Coverage   83.50%   83.50%            
========================================
  Files         342      342            
  Lines       36522    36510    -12     
  Branches    10224    10118   -106     
========================================
- Hits        30497    30487    -10     
+ Misses       5597     5596     -1     
+ Partials      428      427     -1     

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