Fix declarative config model package

[jack-berg]

In #8265, I forgot to change the pojo generation to point to the final io.opentelemetry.sdk.autoconfigure.declarativeconfig.model package. Instead, the pojos are currently mistakenly in io.opentelemetry.sdk.declarativeconfig.internal.model.

This fixes it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.88%. Comparing base (389ddb7) to head (2647c07).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8403   +/-   ##
=========================================
  Coverage     90.88%   90.88%           
  Complexity     7985     7985           
=========================================
  Files           898      898           
  Lines         24107    24107           
  Branches       2406     2406           
=========================================
  Hits          21909    21909           
  Misses         1455     1455           
  Partials        743      743           

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