Replace OTLP User-Agent spaces with dashes

[jack-berg]

Apparently spaces aren't allowable characters in the <product> portion of the User-Agent. See opentelemetry-specification#3052.

[codecov]

Codecov Report

Base: 91.06% // Head: 91.07% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (b4f0696) compared to base (76f7a96).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5080      +/-   ##
============================================
+ Coverage     91.06%   91.07%   +0.01%     
  Complexity     4888     4888              
============================================
  Files           553      553              
  Lines         14453    14453              
  Branches       1381     1381              
============================================
+ Hits          13161    13163       +2     
+ Misses          895      894       -1     
+ Partials        397      396       -1     

Impacted Files	Coverage Δ
...elemetry/exporter/internal/otlp/OtlpUserAgent.java	80.00% <100.00%> (ø)
...metry/sdk/metrics/export/PeriodicMetricReader.java	90.00% <0.00%> (+2.85%)	⬆️

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