test: separate Jest and nyc coverage outputs to fix Codecov upload

[ggazzo]

Jest and nyc were both writing to coverage/lcov.info, causing nyc to overwrite Jest output. Now each writes to its own subdirectory and the codecov action explicitly uploads both files.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.13%. Comparing base (dd56c98) to head (b74448b).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #40083      +/-   ##
===========================================
- Coverage    70.18%   70.13%   -0.05%     
===========================================
  Files         3278     3278              
  Lines       116631   116539      -92     
  Branches     20689    20311     -378     
===========================================
- Hits         81852    81731     -121     
- Misses       31489    31535      +46     
+ Partials      3290     3273      -17     

Flag	Coverage Δ
packages	70.94% <ø> (?)
unit	69.72% <ø> (-1.25%)	⬇️

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[rc-layne]

🔴 Layne — 1 finding(s)

Found 1 issue(s): 1 high.