make getInstrumentationConfig non-null

[zeitlinger]

See #7927 (comment)

Spec PR: open-telemetry/opentelemetry-specification#4817

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.10%. Comparing base (ad8559e) to head (6a85fb0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7954      +/-   ##
============================================
- Coverage     90.11%   90.10%   -0.01%     
+ Complexity     7463     7462       -1     
============================================
  Files           834      834              
  Lines         22586    22585       -1     
  Branches       2240     2239       -1     
============================================
- Hits          20353    20351       -2     
  Misses         1532     1532              
- Partials        701      702       +1     

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[jkwatson]

👍🏽

[jack-berg]

As @trask mentioned in a duplicate PR, this is against the spec. However, as this comment mentioned, we're ok with this because its an incubating module. Should reconcile the spec or the code before stabilizing.

Tracking in #7958