receiver/otlpreceiver: log listener addresses

[axw]

Description

Change otlpreceiver to log the listener addresses, rather than configured endpoints. This enables discovery of ephemeral ports through logs.

My goal is to enable more robust testing of the collector in a framework similar to https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/testbed/testbed

Link to tracking issue

Fixes #13654

Testing

Manually tested

Documentation

None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13655   +/-   ##
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  Coverage        ?   87.64%           
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  Files           ?      632           
  Lines           ?    39697           
  Branches        ?        0           
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  Hits            ?    34794           
  Misses          ?     3657           
  Partials        ?     1246           

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