Fix GraphQL errors extraction for streaming responses

[kikoveiga]

What does this PR do?

Fixes OkHttpGraphQLAdapter#extractGraphQLErrorAttributes so it returns early if there is a streaming response. Otherwise, peekBody might deadlock as described in the issue below. This is exactly the same mechanism used inside DatadogInterceptor#getBodyLength.

Motivation

#3407

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.97%. Comparing base (7a4cd87) to head (f0d8837).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...id/okhttp/internal/graphql/OkHttpGraphQLAdapter.kt	57.14%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3410      +/-   ##
===========================================
- Coverage    72.04%   71.97%   -0.07%     
===========================================
  Files          960      960              
  Lines        35309    35310       +1     
  Branches      5851     5859       +8     
===========================================
- Hits         25435    25411      -24     
- Misses        8276     8290      +14     
- Partials      1598     1609      +11     

Files with missing lines	Coverage Δ
...n/com/datadog/android/okhttp/DatadogInterceptor.kt	80.68% <100.00%> (-0.43%)	⬇️
...id/okhttp/internal/graphql/OkHttpGraphQLAdapter.kt	63.46% <57.14%> (-2.50%)	⬇️

... and 29 files with indirect coverage changes

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