build: DH-20723: Update lerna to v9, to support trusted publishing

[mofojed]

• Lerna added trusted publishing support in v9
• Updated lerna, and ran lerna repair
• Ensure npm run build, npm test, npm start actions all worked

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.48%. Comparing base (1bba969) to head (1568223).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2585    +/-   ##
========================================
  Coverage   45.48%   45.48%            
========================================
  Files         771      771            
  Lines       43591    43591            
  Branches    11027    11211   +184     
========================================
  Hits        19827    19827            
+ Misses      23748    23718    -30     
- Partials       16       46    +30     

Flag	Coverage Δ
unit	45.48% <ø> (ø)

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[mofojed]

Tested using the publish alpha functionality, it worked correctly: https://github.com/deephaven/web-client-ui/actions/runs/19741904934/job/56567606982