enables metrics and tracing by default for local CLI

[ChrisJBurns]

To avoid breaking changes in local setups which by default will export metrics, we want to enable the metrics and tracing exporters by default. Now if the otel-endpoint is provided, toolhive will attempt to export the metrics and traces.

We will leave the defaults for Kubernetes to disabled, this is because this is a new capability so there is no breaking changes here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.29%. Comparing base (c9011cf) to head (6261c93).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1795      +/-   ##
==========================================
+ Coverage   41.20%   41.29%   +0.08%     
==========================================
  Files         184      184              
  Lines       21478    21478              
==========================================
+ Hits         8851     8870      +19     
+ Misses      11955    11933      -22     
- Partials      672      675       +3     

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[coveralls]

coverage: 38.447% (+0.07%) from 38.373%
when pulling 6261c93 on otel-defaults
into c9011cf on main.