fix: missing forceFlush on noop meter provider

[seemk]

AWS Lambda instrumentation needs a forceFlush method to be existing on a meter provider else it logs an error for each span. (https://github.com/open-telemetry/opentelemetry-js-contrib/blob/main/plugins/node/opentelemetry-instrumentation-aws-lambda/src/instrumentation.ts#L296)

The thing is even OTel's own NOOP_METER_PROVIDER doesn't have it.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f0d11d7) 86.10% compared to head (9fdd922) 86.10%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #788   +/-   ##
=======================================
  Coverage   86.10%   86.10%           
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  Files          19       19           
  Lines         662      662           
  Branches      151      151           
=======================================
  Hits          570      570           
  Misses         92       92           

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