fix: support GraphQL::Query::Partial in graphql instrumentation

[utay]

I caught this by using the @stream directive with graphql-ruby and got a NPE on query.selected_operation.operation_type.

Since graphql-ruby 2.5.6, GraphQL::Query::Partial was added for running sub-trees of valid queries. The query argument of execute_query might be a GraphQL::Query::Partial in which case we don't have direct access to the operation type and the query string; I thought in this case it would be nice to see the query path

[linux-foundation-easycla]

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• ✅ login: utay / name: Yannick Utard (2e16b4a, d78a028)

[arielvalentin]

Cc @rmosolgo

[rmosolgo]

LGTM, just needs some support for versions where Query::Partial isn't defined.

[arielvalentin]

Part of our expectations for accepting pull requests is adding automated tests that prevent future regressions.

Please add some test coverage for these changes.

https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/CONTRIBUTING.md#write-comprehensive-automated-tests

[github-actions]

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[kaylareopelle]

Hi @utay! Could you add some test coverage for this change like @arielvalentin mentioned above?

Part of our expectations for accepting pull requests is adding automated tests that prevent future regressions.

Please add some test coverage for these changes.

https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/CONTRIBUTING.md#write-comprehensive-automated-tests

[github-actions]

👋 This pull request has been marked as stale because it has been open with no activity. You can: comment on the issue or remove the stale label to hold stale off for a while, add the keep label to hold stale off permanently, or do nothing. If you do nothing this pull request will be closed eventually by the stale bot