don't call old plugin when declarative config is in use

[zeitlinger]

Fixes #7469

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.98%. Comparing base (dc2874e) to head (23e1c14).

Files with missing lines	Patch %	Lines
...nfigure/AutoConfiguredOpenTelemetrySdkBuilder.java	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7472      +/-   ##
============================================
- Coverage     89.99%   89.98%   -0.01%     
+ Complexity     7078     7076       -2     
============================================
  Files           803      803              
  Lines         21405    21407       +2     
  Branches       2086     2087       +1     
============================================
+ Hits          19263    19264       +1     
+ Misses         1479     1478       -1     
- Partials        663      665       +2     

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[zeitlinger]

@jack-berg please have a look 😄

[zeitlinger]

@jkwatson please have a look