chore(deps): remove unused rimraf dev dependency

[aabmass]

Looking at https://github.com/search?q=repo%3AGoogleCloudPlatform%2Fopentelemetry-operations-js%20rimraf&type=code, this doesn't even seem to be used directly

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (7f1ee19) to head (2e042ea).
Report is 51 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #771   +/-   ##
=======================================
  Coverage   97.72%   97.72%           
=======================================
  Files          18       18           
  Lines         703      704    +1     
  Branches      136      136           
=======================================
+ Hits          687      688    +1     
  Misses         16       16           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.