chore: Remove redundant LICENSE files from individual crates

[cijothomas]

Same as open-telemetry/opentelemetry-rust#3086 done in main repo

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.6%. Comparing base (33ce11f) to head (f58e31e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #397   +/-   ##
=====================================
  Coverage   47.6%   47.6%           
=====================================
  Files         69      69           
  Lines       9716    9716           
=====================================
  Hits        4633    4633           
  Misses      5083    5083           

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