Rename artifact to opentelemetry-exporter-sender-okhttp

[jack-berg]

Related to #5572. Talked about in the 6/29 java SIG and agreed that we should rename the new okhttp http sender artifact to opentelemetry-exporter-sender-okhttp to reduce artifact churn when the scope is expanded to include a GrpcSender implementation.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (83de956) 91.35% compared to head (ef1ac84) 91.35%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5582   +/-   ##
=========================================
  Coverage     91.35%   91.35%           
  Complexity     4969     4969           
=========================================
  Files           552      552           
  Lines         14581    14581           
  Branches       1358     1358           
=========================================
  Hits          13320    13320           
  Misses          872      872           
  Partials        389      389           

Impacted Files	Coverage Δ
...ry/exporter/internal/http/HttpExporterBuilder.java	92.15% <ø> (ø)
...orter/sender/okhttp/internal/OkHttpHttpSender.java	98.43% <ø> (ø)
...nder/okhttp/internal/OkHttpHttpSenderProvider.java	100.00% <ø> (ø)

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