feat(api): Add cause for graphql connection errors

[jvh-aws]

• PR title and description conform to Pull Request guidelines.

Issue #, if available: #2827

Description of changes:

• Wrap GraphQL connection errors into GraphQLResponseException
• Propagate cause up as part of ApiException on subscribe or query connection errors
• Add tests

How did you test these changes?

• Manual testing using reproducer app
  • Verified cause is provided for both network and not-authorized errors when establishing connection using queries / subscriptions
  • Verified error handling for GraphQL errors (after connection established) works, e.g. when response cannot be parsed due to schema out-of-sync issues
• Unit tests

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(storage): message, feat(auth): message, chore(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.81%. Comparing base (8c9039f) to head (d438f53).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3183      +/-   ##
==========================================
+ Coverage   54.79%   54.81%   +0.02%     
==========================================
  Files        1049     1050       +1     
  Lines       31361    31401      +40     
  Branches     4695     4699       +4     
==========================================
+ Hits        17183    17214      +31     
- Misses      12369    12378       +9     
  Partials     1809     1809              

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