Fix declarative Jaeger sampler interval configuration

[abdessattar23]

The declarative Jaeger remote sampler exposes its polling interval as interval, but the provider reads internal. This causes configured intervals to be ignored in favor of the default.

This updates the key and adds regression coverage for configured and default intervals.

fixes #8648

[opentelemetry-pr-dashboard]

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Waiting on reviewers · refreshed 2026-07-29 01:36 UTC

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.48%. Comparing base (54076d3) to head (4c199ac).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8668   +/-   ##
=========================================
  Coverage     91.47%   91.48%           
- Complexity    10458    10459    +1     
=========================================
  Files          1021     1021           
  Lines         27647    27652    +5     
  Branches       3242     3242           
=========================================
+ Hits          25290    25297    +7     
+ Misses         1616     1614    -2     
  Partials        741      741           

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