fix(server): initialize OpenTelemetry from config/otel.yaml

[randy-cro]

cosmos-sdk bootstraps OTel in server.start, but is not present in ethermint, so when cronos starts <home>/config/otel.yaml is never read: instruments configured there stayed attached to the noop provider and emitted nothing.

Missing and empty files remain a no-op, so nodes without a configured otel.yaml are unaffected.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.06%. Comparing base (d263d89) to head (44e4f5d).
⚠️ Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
server/start.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1099      +/-   ##
===========================================
+ Coverage    47.03%   47.06%   +0.02%     
===========================================
  Files          200      200              
  Lines        17626    17637      +11     
===========================================
+ Hits          8291     8300       +9     
- Misses        8473     8475       +2     
  Partials       862      862              

Files with missing lines	Coverage Δ
server/start.go	1.38% <0.00%> (-0.04%)	⬇️

... and 1 file with indirect coverage changes

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