feat(opentelemetry-configuration): support file with format rc.2

[maryliag]

Update the kitchen sink example, to use the latest from the spec, and parsing also with format from rc.2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.01%. Comparing base (91e0d23) to head (34ecb7d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6029   +/-   ##
=======================================
  Coverage   95.01%   95.01%           
=======================================
  Files         313      313           
  Lines        8799     8799           
  Branches     1888     1888           
=======================================
  Hits         8360     8360           
  Misses        439      439           

Files with missing lines	Coverage Δ
...ntelemetry-configuration/src/FileConfigProvider.ts	95.27% <100.00%> (ø)

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[pichlermarc]

looks good 👍

[pichlermarc]

not for now, but when we eventually go GA with this we should stop supporting all but the latest version.