Only log if superagent is enabled

[jtduffy]

Only log SuperAgent related info if the SA is in fact enabled.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.

Project coverage is 70.70%. Comparing base (4431da3) to head (0437e5d).

Files with missing lines	Patch %	Lines
...com/newrelic/agent/service/ServiceManagerImpl.java	12.50%	6 Missing and 1 partial ⚠️
...agent/superagent/SuperAgentIntegrationService.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2156      +/-   ##
============================================
- Coverage     70.74%   70.70%   -0.04%     
+ Complexity    10006    10000       -6     
============================================
  Files           842      842              
  Lines         40346    40348       +2     
  Branches       6115     6115              
============================================
- Hits          28542    28529      -13     
- Misses         9054     9066      +12     
- Partials       2750     2753       +3     

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