fix: use graphql utilties for more reliable check for class types

Description

It is possible for multiple versions of the graphql module to exist which causes the instanceof checks to fail. This PR uses the utilites from graphql to check instead, which under the covers uses string compare

Fixes # 2477

Type of change

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[x] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update

Screenshots/Sandbox (if appropriate/relevant):

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How Has This Been Tested?

Ran the tests.

Checklist:

[x] I have followed the CONTRIBUTING doc and the style guidelines of this project
[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas
[x] I have made corresponding changes to the documentation
[x] My changes generate no new warnings
[x] I have added tests that prove my fix is effective or that my feature works
[x] New and existing unit tests and linter rules pass locally with my changes
[x] Any dependent changes have been merged and published in downstream modules

Further comments

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Urigo / graphql-modules