Update declaratvie config jaeger remote sampler to require endpoint, initial_sampler

[jack-berg]

https://github.com/open-telemetry/opentelemetry-configuration/blob/main/schema-docs.md#experimentaljaegerremotesampler-

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.13%. Comparing base (7a46bc5) to head (2c387e1).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7943      +/-   ##
============================================
+ Coverage     90.10%   90.13%   +0.02%     
- Complexity     7439     7441       +2     
============================================
  Files           834      834              
  Lines         22546    22547       +1     
  Branches       2236     2236              
============================================
+ Hits          20316    20322       +6     
+ Misses         1531     1528       -3     
+ Partials        699      697       -2     

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[jkwatson]

Thanks!